BRISCOE, Circuit Judge.

Plaintiffs, a group of entities and individuals that own businesses or real property located on Central Avenue in Albuquerque, New Mexico, filed this action seeking to enjoin the City of Albuquerque (the City) from proceeding with construction of a rapid transit bus system along Central Avenue. Plaintiffs claim, in pertinent part, that the City and the Federal Transit Administration, from whom the City seeks federal funding for the project, violated the National Environmental Policy Act, 42 U.S.C. §§ 4321 et seq., and the National Historic Preservation Act, 54 U.S.C. §§ 300101 et seq., in the course of planning the project. The district court denied plaintiffs' request for a preliminary injunction. Plaintiffs have now filed an interlocutory appeal challenging that ruling. Exercising jurisdiction pursuant to 28 U.S.C. § 1292(a)(1), we affirm.

I

Central Avenue and its current public transit system

Central Avenue in Albuquerque, New Mexico, is a major east-west street that was part of U.S. Route 66 until that highway was decommissioned in 1985. Currently, "[t]he Central Avenue corridor provides direct transit and vehicular access to two major employment/activity centers including the University of New Mexico (UNM) and the Albuquerque Downtown/Central Business District area." App., Vol. 1 at 70-71. UNM's central campus "is bounded on the south by Central Avenue." Id. at 71. "Central Avenue [also] passes through the heart of the Downtown area and is within one to four blocks of almost every major building in the Central Business District." Id. "[T]wo major entertainment districts," Downtown and an area known as "Nob Hill," are "located on Central Avenue and are popular destinations for tourists and locals." Id.

Albuquerque's bus system, known as ABQ RIDE, currently offers three transit routes that "serve Central Avenue: Route 66, Route 766 (Red Line), and Route 777 (Green Line)." Id. at 70. Routes 766 and 777 are part of what is known as "ABQ RIDE's Rapid Ride system." Id. These two routes operate in mixed-flow lanes, meaning that the lanes serve both ABQ Ride buses as well as other types of vehicles. "Central Avenue is ABQ Ride's highest ridership corridor." Id.

The ART Project

In order "to improve transit service along Central Avenue, and to improve access to major activity and employment centers located" along Central Avenue, the City has proposed what is known as the "Albuquerque Rapid Transit (ART) [P]roject." Id. "The ART system [will] include[ ] the construction of a rapid vehicle guideway within the street median [on Central Avenue] and stations spaced at ½ to 1 mile intervals." Id. at 71. "All proposed construction [will be] within the operational right-of-way of Central Avenue," id., with the exception of "narrow slivers of property at major intersections" that the City intends to acquire, id. at 75. "The traffic signal system for Central Avenue within the project limits will be modified to provide traffic signal priority for ART vehicles." Id. at 72.

ART buses will, depending upon the particular section of Central Avenue, operate either in mixed-flow traffic (meaning they will utilize the same lanes as other vehicles) or in their own exclusive lanes. Some sections of Central Avenue will feature two exclusive rapid vehicle lanes, while other sections will feature one bidirectional rapid vehicle lane. For example, "exclusive lanes for rapid vehicles will be constructed from Coors Boulevard to Louisiana Boulevard — a distance of approximately 8.75 miles." Id. at 70. These rapid vehicle routes will replace Routes 766 and 777.

In order to install the ART system, the City plans to make a number of changes to Central Avenue. These include, but are not limited to:

Id. at 73.

"Traffic will be affected by three aspects of the ... project." Id. at 81. These include: (1) "the reduction of general purpose traffic lanes in" certain segments of Central Avenue; (2) "changes to the traffic signal system on Central Avenue to integrate a signal priority system for preferential rapid vehicle operations"; and (3) "median closures that will shift left-turns and U-turns at existing median openings to signalized intersections." Id.

Thus, "[t]raffic capacity will be reduced in some segments" of Central Avenue "as a result of traffic lane reductions." Id. at 75. Further, because "[t]he rapid vehicle lanes will have limited access to other vehicles,... access to the businesses and other development on Central Avenue will be less than currently exists." Id. The City alleges, however, that "[r]easonable access to all businesses will be maintained with left turn/U-turn access provided at signalized intersections." Id. "In general, left turn/U-turn access [will be] spaced approximately every one quarter mile from Coors Boulevard to Louisiana Boulevard." Id.

The ART project will pass "through four historic districts." Id. at 86. "The stations in these districts have been designed without canopies to avoid any visually prominent features." Id. "There are [also] 127 historic properties within the project [area] that are listed, eligible for listing, or have an undetermined eligibility to the [National Register of Historic Places]." Id. "No property from any of the historic buildings will be directly impacted or altered by the project." Id.

The City's request for a Small Starts grant from FTA

The Federal Transit Administration (FTA), a federal agency that is a division of the United States Department of Transportation (DOT), administers the "Small Starts" program as part of its Capital Investment Grant Program, which supports locally planned transit projects. See 49 U.S.C. § 5309(b); 49 C.F.R. § 611.101. By statute, Congress has encouraged the use of "small start project[s] utilizing buses... in a defined corridor ... that emulate the services provided by rail fixed guideway public transportation systems." 49 U.S.C. § 5309(a)(3), (h).

There is conflicting information in the record concerning whether the City has submitted a Small Starts grant application to the FTA. According to the City, it did so on July 13, 2015, and its alleged purpose in doing so was to seek approximately $69,000,000 in Small Starts funds. Such funding, according to the City, would comprise approximately 55% of the estimated construction cost of $126.2 million. In contrast, the FTA asserts that the City has yet to file a formal Small Starts grant application. FTA Aplee. Br. at 13 n.2. Consequently, the FTA asserts, it "has not yet made a final decision whether to award a grant" to the City for the ART Project. Id.

The City's and FTA's NHPA analysis

Federal funding for the ART Project, should it occur, would subject the ART Project to analysis under the National Historic Preservation Act (NHPA), 54 U.S.C. § 300101 et seq. Specifically, Section 106 of NHPA imposes a procedural requirement that, before approving a "federally assisted undertaking," a federal agency "shall take into account the effect of the undertaking on any historic property." Id. § 306108. A "historic property" is any property that is "in, or eligible for inclusion in," the National Register of Historic Places. Id. § 300308. The agency must consult with the relevant State Historic Preservation Officer (SHPO) to identify those properties, identify any adverse effects that a proposed project might have on them, and then evaluate modifications to the project that would avoid, minimize, or mitigate those adverse effects to the SHPO's satisfaction. See 36 C.F.R. §§ 800.3-800.6; Valley Cmty. Pres. Comm'n v. Mineta, 373 F.3d 1078, 1085 (10th Cir. 2004).

The City, aware that it intended at some point to seek federal funding for the ART Project, began the SHPO consultation process on June 4, 2014. The City was assisted in this process by Jeffrey Fredine, an environmental planner, historian, and cultural resource specialist who worked for a private consulting firm. On June 4, 2014, the City met with employees from the New Mexico Historic Preservation Department (HPD), which acts as the SHPO for purposes of NHPA. "That meeting included a discussion of the nature and extent of [the ART] Project and consideration of detailed drawings of ART, including changed lane configurations, streetscape improvements, and station construction, to understand what impact [the] ART [Project] would have." App., Vol. 4 at 538. The SHPO "suggested that a variable [area of potential effect (APE)] should be defined around each proposed station site based on the level of historic integrity at each location and the amount of previous documentation that exist[ed] for each area." Id., Vol. 12 at 1705.

On June 14, 2014, the City and the SHPO "conducted field reconnaissance of the entire [ART] [P]roject area," id., Vol. 12 at 1705, in order "to assess first-hand how ART might affect historic resources," id., Vol. 4 at 538. The City and SHPO determined that the ART Project would not physically touch or use any historic resource. But the SHPO nevertheless "identified eight areas of potential concern that could constitute or contribute to an historic district or cultural landscape." Id., Vol. 12 at 1705. The City and the FTA ultimately "defined a variable APE for each specific [ART] station location." Id., Vol. 12 at 1705. "Generally, the APE include[d] 300 feet on either side of intersections within the eight areas identified as having the most historic integrity within the [ART] [P]roject area, and 100 feet on either side of the intersections outside of these areas." Id. at 1705-06. "The potential for possible effects to be considered" in those areas "would be in [the] visual impacts at the station locations and how that might affect the historic setting of a property." Id., Vol. 24 at 3049-50. The SHPO ultimately agreed that this was the appropriate APE.

The City then "conducted a detailed review of the APE to identify historic and cultural resources." Id., Vol. 4 at 538. This review "process identified 138 historic or potentially historic properties in the APE that could be affected by [the] ART [Project]." Id. at 538-39. The City's study culminated in a March 12, 2015 "Cultural Resources Inventory." Id., Vol. 13 at 1731. On April 6, 2015, the FTA transmitted the Cultural Resources Inventory to the SHPO and asked the SHPO "to concur in [the] FTA's finding that [the] ART [Project] would not have any adverse effect on any historic resource, primarily due to the lack of physical use on any historic property and limited scope of construction." Id., Vol. 4 at 539.

On April 8, 2015, the SHPO refused to concur, "citing concerns over the visual impact of three ART [Project] stations on surrounding historic districts." Id. The FTA, the City, and the SHPO subsequently "met and discussed the ... SHPO's concerns regarding visual impacts." Id. The SHPO "made clear that its concerns were limited to the visual impact of the canopies over three specific stations — Rio Grande, 15th Street, and Walter Street — because of the historic significance and integrity of the surrounding neighborhood." Id.

On June 25, 2015, the FTA sent an "Addendum Cultural Resources Inventory" to the SHPO that "memorialized the commitment of the City and [the] FTA to eliminate the canopies at the three stations in response to address [the SHPO's] concerns." Id. "The letter included renderings of the redesigned stations." Id.

On July 7, 2015, the SHPO "issued a letter concurring with [the] FTA that [the] ART [Project] would not have any adverse effects on any historic or cultural resources." Id.

The ART Project — Categorical Exclusion

The nature and amount of the Small Starts grant that the City is purportedly seeking from the FTA also subjects the ART Project to analysis under the National Environmental Policy Act (NEPA). More specifically, the FTA, before awarding any grant money, is required to assess the environmental impacts of the ART Project, consider alternatives with less environmental impact, and evaluate whether the benefits of the project would exceed its impact on the environment.

On or about August 17, 2015, the City applied to the FTA for a "documented exception from the requirement that the City or the FTA prepare an environmental impact statement (EIS) or environmental assessment (EA). In support of its application, the City prepared and submitted a "[Categorical Exclusion] Worksheet," which was, in essence, "an extensive, 1,174-page environmental review package." Id. at 536.

On August 26, 2015, the FTA sent a letter to the City informing it that the FTA had completed its review of the City's application and "ha[d] determined that the proposed ART [P]roject me[t] the criteria for Categorical Exclusion [(CE)] in accordance with 23 CFR Part 771.118(d)." Id., Vol. 1 at 112. The FTA also confirmed that it had "determine[d] the project w[ould] result in a `no adverse effect' on historic properties" under NHPA, and it noted that the "SHPO concurred with this determination on July 7, 2015." Id.

The FTA's Letter of No Prejudice

As noted, the FTA alleges that it "has not yet made a final decision whether to award a grant" to the City for the ART Project. FTA Aplee. Br. at 13 n.2. Nevertheless, on July 18, 2016, the FTA issued to the City a "Letter of No Prejudice" (LONP). Id. at 866. "The LONP provides the opportunity for the City immediately [to] spend up to $59 million dollars that is eligible for reimbursement by the FTA for the ART [P]roject." Id.

The plaintiffs

The plaintiffs in this action, all of whom own businesses or property located on Central Avenue in Albuquerque, New Mexico, include the following:

The complaint

On April 4, 2016, plaintiffs filed a complaint for declaratory, statutory, and injunctive relief against the FTA, the Regional Director for Region VI of the FTA (Robert Patrick), the Director of Planning and Program Development of the FTA (Donald Koski), the City, the mayor of the City (Richard Berry), and the Director of ABQ-RIDE Transit (Bruce Rizzieri).1 Count I of the complaint sought review under the Administrative Procedure Act (APA) of the FTA's decision under NEPA to grant a CE in connection with the ART Project. Count II of the complaint alleged that the FTA and the City failed to properly consider and evaluate the impact the ART Project "would have on the historical integrity of Route 66 and its adjacent historic resources," and that the FTA and the City thereby violated ... [NHPA]." Id. at 63. Count III of the complaint alleged that the City violated the New Mexico Prehistoric and Historic Sites Preservation Act by failing to "properly consider and evaluate the impact that the ART project would have on the historical integrity of Route 66 itself and the historic sites adjacent to it." Id. at 64. Count IV of the complaint alleged that the City violated its own Complete Streets Ordinance because "[t]he ART [P]roject does not balance the need to move vehicles efficiently with the other context sensitive outcomes the City was required to consider" under the ordinance. Id. at 66.

Plaintiffs allege in their complaint that the ART Project will have a significant impact on both travel patterns and the human environment along Central Avenue. Id. at 54. In particular, plaintiffs allege that the ART project will have the following detrimental impacts:

Motion for preliminary injunction

On June 9, 2016, the plaintiffs filed a motion for preliminary injunction asking the district court "to preliminarily enjoin" the City and the FTA "from taking any actions in furtherance of" the ART Project. Id. at 124. In support of their motion, plaintiffs argued that they were substantially likely to succeed on the merits of their claims that (1) the FTA arbitrarily and capriciously granted the City a CE for the ART Project, (2) the FTA's grant of a CE to the City was in violation of NHPA, (3) the ART Project violates the New Mexico Prehistoric and Historic Sites Preservation Act, and (4) the ART Project violates the City's own Complete Streets ordinance. Id. at 176.

The district court held a three-day evidentiary hearing on the plaintiffs' motion from July 27 to 29, 2016.2 During that hearing, the plaintiffs "focused [exclusively] on the[ir] NEPA and NHPA claims." Id. at 1054.

On July 29, 2016, the district court issued a written memorandum opinion and order denying plaintiffs' motion for preliminary injunction. In doing so, the district court concluded that the FTA's CE and NHPA determinations were not arbitrary or capricious and that, consequently, the plaintiffs had failed to establish a substantial likelihood of success on the merits of their claims that the FTA violated NEPA and NHPA. The district court further concluded that plaintiffs had failed to establish irreparable harm, noting "that the ART lanes could be redesignated as general use lanes without much trouble" and that plaintiffs' alleged economic injuries would be "compensable with monetary damages." Id., Vol. 7 at 1063. Relatedly, the district court concluded that "the evidence show[ed] any harm w[ould] also not be `certain or great,'" and that plaintiffs failed to "provide[ ] any specific numbers or hard projections ... to show how much business will be lost." Id. In addition, the district court concluded that the balance of equities and the public interest weighed in favor of not granting a preliminary injunction. In that regard, the district court noted that "not allowing ART to go forward w[ould] keep the City from building a project to revitalize the area and address pedestrian safety and improve transit efficiency," and would also "lead to increased construction costs." Id. at 1065. Finally, the district court concluded that "[a] preliminary injunction, on the whole, would be adverse to the public interest." Id. at 1066.

Notice of appeal

On July 31, 2016, plaintiffs filed a notice of appeal from the district court's memorandum opinion and order denying their motion for preliminary injunction.

II

Plaintiffs raise six separate issues on appeal. Two of those issues deal with evidentiary rulings made by the district court in the course of denying plaintiffs' motion for preliminary injunction. The remaining four issues address the merits of the district court's order denying the motion for preliminary injunction. As discussed below, we conclude that all of these issues lack merit.

Standards of review

"We review the denial of a preliminary injunction for abuse of discretion." Hobby Lobby Stores, Inc. v. Sebelius, 723 F.3d 1114, 1128 (10th Cir. 2013), aff'd sub nom Burwell v. Hobby Lobby Stores, Inc., ___ U.S. ___, 134 S.Ct. 2751, 189 L.Ed.2d 675 (2014). "An abuse of discretion occurs where a decision is premised on an erroneous conclusion of law or where there is no rational basis in the evidence for the ruling." Fish v. Kobach, 840 F.3d 710, 723 (10th Cir. 2016) (quotation marks omitted). "Thus, we review the district court's factual findings for clear error and its conclusions of law de novo." Id.

As for the evidentiary rulings made by the district court in connection with denying the plaintiffs' motion for preliminary injunction, we apply an abuse of discretion standard. See Monfore v. Phillips, 778 F.3d 849, 854 (10th Cir. 2015) ("Appellate courts review evidentiary complaints only for abuse of discretion."); Hancock v. Am. Tel. and Tel. Co., 701 F.3d 1248, 1262 (10th Cir. 2012) ("We review a district court's ruling on ... a motion to strike [an affidavit or declaration] for abuse of discretion.").

The two evidentiary challenges

In Issues II and V of their opening brief, plaintiffs challenge evidentiary rulings made by the district court in the course of ruling on their motion for preliminary injunction. Specifically, in Issue II, plaintiffs argue that the district court erred in striking their expert and lay declarations as inadmissible opinion evidence regarding the ART Project's environmental impacts. In Issue V, plaintiffs argue that the district court erred in excluding as irrelevant what they refer to as the "de Garmo" email. For the reasons discussed below, we conclude that the district court did not abuse its discretion in either regard.

1) Striking of plaintiffs' expert and lay declarations

Prior to the evidentiary hearing on plaintiffs' motion for preliminary injunction, the federal defendants moved to strike both lay and expert declarations that were submitted by plaintiffs in connection with their motion.

On July 15, 2016, the district court issued a written memorandum opinion and order granting the motion to strike the declarations to the extent they went beyond issues of standing and personal expressions of irreparable harm. In doing so, the district noted that its "role in this lawsuit [wa]s to review the FTA's decision to grant the CE application based upon the materials before the FTA at the time of its decision and upon acceptable extra-record materials, if any." App., Vol. 6 at 840. With respect to the lay declarations submitted by plaintiffs, the district court noted that plaintiffs were arguing that such declarations "provide[d], through common sense, evidence that the FTA failed to consider ART's impact on businesses and adjoining neighborhoods." Id. at 841. The district court concluded, however, that "when it comes to a multi-faceted and complex project like the ART [P]roject, ... the proposed `common sense' standard [was] unhelpful," as well as "ambiguous and subjective at best." Id. With respect to the two expert opinions challenged by the federal defendants (those of Dr. Gregory Rowangould and Paul Lusk), the district court noted that "the FTA was not required to rely on its own experts, but instead could rely on the City's experts whose reports are included in the Preliminary Administrative Record." Id. Further, the district court noted that "Rowangould and Lusk, in their declarations, attack[ed] the reliability of the City's methodology" and thus "disagree[d] with the City's experts." Id. at 841-42. "Such a disagreement between experts on the correct methodology to utilize," the district court concluded, "does not provide a sufficient reason to allow Rowangould and Lusk's extra-record declarations." Id. at 842.

On appeal, plaintiffs argue that it was "clear error" for the district court to strike these declarations. Aplt. Br. at 34. As noted, however, the district court's decision is not reviewed for clear error, but rather for an abuse of discretion.

In any event, plaintiffs argue that our decision in Lee v. Air Force, 354 F.3d 1229 (10th Cir. 2004), supports their submission of the declarations and undercuts the district court's decision to strike those declarations. Plaintiffs are wrong, however. In Lee, we held that in a NEPA-based action, "judicial review of agency action is normally restricted to the administrative record," and that "consideration of extra-record materials is appropriate [only] in `extremely limited' circumstances, such as where the agency ignored relevant factors it should have considered or considered factors left out of the formal record." Id. at 1242. To be sure, plaintiffs in this case assert that their declarations "attempted to show, through common sense (Coalition plaintiffs) and expert opinion (Rowangould and Lusk) that there were numerous environmental impacts that ART would have that the FTA had failed to consider." Aplt. Br. at 33. But plaintiffs make no attempt in their appellate brief to identify what those impacts are.

In its order striking the declarations, the district court noted that "the City's reports in the Preliminary Administrative Record address[ed] many of the factors ... Plaintiffs assert[ed] the FTA did not consider, albeit in a manner which... Plaintiffs disagree[d] with." App., Vol. 6 at 840. These factors, the district court noted, included "impacts on traffic, access to businesses, pedestrian safety, bus ridership, and storm water issues as well as consideration of public comment." Id. The district court "note[d] that the Preliminary Administrative Record d[id] not appear to contain a study or analysis of the economic impact of ART on businesses." Id. Nevertheless, the district court concluded that "the evidence in the [lay] declarations concerning a negative impact on businesses [wa]s unsubstantiated and, therefore, not helpful to the Court." Id. at 840-41. Notably, plaintiffs make no reference to these conclusions at all, and therefore fail to demonstrate that the district court abused its discretion in striking the lay declarations.

As for the two expert declarations, the district court, as noted, concluded that they simply "disagree[d] with the City's experts" and thus were not properly considered. Id. at 842. Again, plaintiffs make no attempt to address this rationale, let alone demonstrate that the district court abused its discretion in striking the expert declarations.

In sum, plaintiffs have failed to establish that the district court abused its discretion in striking the lay or expert declarations.

2) Exclusion of the de Garmo email

At the evidentiary hearing, plaintiffs sought to admit an email message that Andrew de Garmo, the head of planning for the City's transit department, sent to other ART Project officials on February 19, 2014. The email message read, in pertinent part: "I've been wrong on a crucial point, and I apologize for muddying the issues. A BRT project does not need to have any dedicated lanes to qualify for Small Starts funding; it only needs to have >50% dedicated lanes to qualify for New Starts funding." App., Vol. 21 at 2643. The district court excluded the email message on the grounds that it was not "sufficiently probative" under Federal Rule of Evidence 403. App., Vol. 25 at 3194-95.

Plaintiffs argue on appeal that "the District Court's failure to admit or consider the email was clear error." Aplt. Br. at 41. As we have noted, however, the district court's evidentiary ruling is not subject to review for clear error, but rather for an abuse of discretion, and plaintiffs make no attempt to argue that the district court abused its discretion.

In any event, having reviewed the record, we conclude that the district court did not abuse its discretion in excluding the email message. Although plaintiffs argue that the message "established the truth of the design being unnecessary" and "went directly to the issues of balance of harms and the public's interest in the event of an injunction," we conclude that the email message was irrelevant to any of the preliminary injunction factors considered by the district court. Aplt. Br. at 41. To begin with, the email message had no relevance to the question of whether the FTA properly complied with NEPA or NHPA. As for the balance of harms and public interest factors (which will be discussed in greater detail below), plaintiffs make no attempt to explain precisely how de Garmo's email message could be relevant. At best, the message suggests that a key design feature of the ART Project — i.e., dedicated bus lanes down the median of Central Avenue — was unnecessary for the City to obtain federal funding for the ART Project. But it does not otherwise undercut the reasons forwarded by the City for designing and implementing the ART Project in the first place.

The substantive challenges

The remaining four issues raised by plaintiffs on appeal (Issues I, III, IV and VI) are substantive challenges to the district court's decision to deny their motion for preliminary injunction. These four issues, all of which lack merit, will be addressed in the context of the standards outlined in Federal Rule of Civil Procedure 65(a) for the issuance of preliminary injunctions.

Rule 65(a) authorizes district courts to issue preliminary injunctions. Generally speaking, a plaintiff "seeking a preliminary injunction must establish that [it] is likely to succeed on the merits, that [it] is likely to suffer irreparable harm in the absence of preliminary relief, that the balance of equities tips in [its] favor, and that an injunction is in the public interest." Winter v. Nat. Res. Def. Council, Inc., 555 U.S. 7, 20, 129 S.Ct. 365, 172 L.Ed.2d 249 (2008).

Likelihood of success on the merits

"The very purpose of an injunction under Rule 65(a) is to give temporary relief based on a preliminary estimate of the strength of the plaintiff's suit, prior to the resolution at trial of the factual disputes and difficulties presented by the case." 11A Charles Alan Wright, Arthur R. Miller & Mary Kay Kane, Federal Practice and Procedure, § 2948.3, at 213-14 (2013). Although "[t]he courts use a bewildering variety of formulations of the need for showing some likelihood of success," id. at 197, "[a]ll courts agree that plaintiff must present a prima facie case but need not show a certainty of winning." Id. at 201.

As we have noted, the plaintiffs ultimately based their motion for preliminary injunction on two of the claims alleged in their complaint: (1) the claim in Count I that the FTA acted arbitrarily and capriciously in granting a CE in connection with the ART Project; and (2) the claim in Count II that the FTA violated NHPA by failing to properly consider and evaluate the impact of the ART Project on the historical integrity of Route 66 and its adjacent historic resources. Both of these claims constitute challenges to final agency action under the APA.

1) The APA

Because neither NEPA nor NHPA "provide a private right of action, we review" the two FTA decisions as "final agency action[s] under the" APA. Utah Env't Cong. v. Russell, 518 F.3d 817, 823 (10th Cir. 2008). "When courts consider such challenges, an agency's decision is entitled to a presumption of regularity, and the challenger bears the burden of persuasion." San Juan Citizens All. v. Stiles, 654 F.3d 1038, 1045 (10th Cir. 2011) (citation omitted). But we "can set aside an agency decision if it is `arbitrary, capricious, an abuse of discretion, or otherwise not in accordance with law.'" Id. (quoting 5 U.S.C. § 706(2)(A)). An agency's decision will be deemed arbitrary and capricious "`if the agency (1) entirely failed to consider an important aspect of the problem, (2) offered an explanation for its decision that runs counter to the evidence before the agency, or is so implausible that it could not be ascribed to a difference in view or the product of agency expertise, (3) failed to base its decision on consideration of the relevant factors, or (4) made a clear error of judgment.'" Id. (quoting New Mexico ex rel. Richardson v. Bureau of Land Mgmt., 565 F.3d 683, 704 (10th Cir. 2009)).

2) The NEPA-based claim

NEPA "requires federal agencies... to analyze environmental consequences before initiating actions that potentially affect the environment." Utah Env't Cong. v. D. Bosworth, 443 F.3d 732, 735-36 (10th Cir. 2006). Notably, NEPA "does not mandate particular results," but rather "imposes only procedural requirements to ensure that [a federal] agency, in reaching its decision, will have available, and will carefully consider, detailed information concerning significant environmental impacts." Winter, 555 U.S. at 23, 129 S.Ct. 365 (quotation marks omitted). Specifically, in conducting its environmental analysis under NEPA, a federal agency "must prepare one of the following: (1) an environmental impact statement [(EIS)], (2) an environmental assessment [(EA)], or (3) a categorical exclusion [(CE) ]." Id. at 736.

The "most rigorous" of these three options is the EIS. Id. An EIS "is required if a proposed action will `significantly affect[] the quality of the human environment.'" Id. (quoting 42 U.S.C. § 4332(C)). "If an agency is uncertain whether the proposed action will significantly affect the environment, it may prepare a considerably less detailed [EA]." Id. Preparation of an EA helps the agency "determine whether a proposed project will create a significant effect on the environment" and thereby require preparation of an EIS. Id. Finally, "[i]n certain narrow instances, ... an agency is not required to prepare either an [EA] or an [EIS]." Id. "This occurs when the proposed action falls within a [CE], i.e., those actions predetermined not to `individually or cumulatively have a significant effect on the human environment.'"3 Id. (quoting 40 C.F.R. § 1508.4).

The role of a federal court under NEPA is to review the EIS, EA, or CE, as the case may be, and "simply ... ensure that the agency has adequately considered and disclosed the environmental impact of its actions." Wyo. v. United States Dep't of Agric., 661 F.3d 1209, 1256-57 (10th Cir. 2011) (quotation marks omitted).

The district court in this case, applying these principles, rejected the plaintiffs' assertion that the FTA failed to "take a `hard look' at the City's CE application and that the FTA's decision to approve the CE application was arbitrary and capricious." App., Vol. 7 at 1058. The district court noted that defendant "Donald Koski, [the] Director of Planning and Program Development of Region VI of the FTA," testified at the evidentiary hearing "that his staff reviewed a draft of the CE application, communicated with the City regarding its project development request, consulted with the SHPO, and reviewed the final CE application as did [he]." Id. "These actions," the district court concluded, "demonstrate[d] that the FTA took the required `hard look' at the CE application." Id.

The district court also rejected the plaintiffs' argument "that the FTA's action was arbitrary and capricious because the City's CE application did not consider economic impacts on businesses or traffic issues such as congestion and diversion of traffic to neighborhoods adjacent to Central Avenue." Id. In doing so, the district court noted that "[t]he City ... provide[d] the FTA with a business access technical supplement and a traffic assessment technical supplement in response to the CE worksheet's request for information related to `economic environment' and traffic patterns." Id. And "[t]hose supplements," the district court noted, "indicate[d] that no business w[ould] lose access, congestion w[ould] be minimized with signalized left and u-turns, and that diversion into neighborhoods would amount to 250 vehicles daily." Id. The district court also noted that "[t]he diversion number [wa]s supported by a traffic engineer's expert opinion." Id. The district court thus "conclude[d] that the FTA considered relevant factors, like economic environment and traffic patterns." Id. at 1059.

Lastly, the district court rejected the plaintiffs' argument that the FTA should not have approved the CE "because there was a `substantial controversy on environmental grounds.'" Id. The district court noted that although "[t]he CE application include[d] a detailed summary of comments, including negative comments," it concluded that "those comments d[id] not suggest `substantial controversy on environmental grounds.'" Id. More specifically, it noted that "[g]eneral concerns and even economic impacts are not `environmental grounds' for purposes of assessing public controversy." Id. "Moreover," the district court noted, "the negative comments did not identify a substantial controversy over the size, nature or effect of the environmental impacts." Id. at 1060. "Instead," the district court noted, "many people complained about cost, access to businesses, lost parking, removal of the median, and preferred alignments," none of which "meet the legal test." Id.

In Issue I of their appeal, plaintiffs contend the district court erred in concluding "that the FTA could satisfy its `hard look' requirement by examining the City's submissions, rather than at the project's environmental effects themselves." Aplt. Br. at 17-18. In other words, plaintiffs argue, it "is impermissible under NEPA" for the FTA to rely exclusively on the City's submissions. Id. at 31. But plaintiffs did not make this argument below, nor did they cite below the cases they now cite in their appellate brief. Indeed, this argument appears to be contrary to the arguments made by plaintiffs in their motion for preliminary injunction. In their preliminary injunction motion, plaintiffs argued that "[t]he FTA had all the evidence it needed to show that a CE was inappropriate for ART." App., Vol. 2 at 211. More specifically, plaintiffs argued that "the data submitted by the City in its CE and grant applications, if the FTA had examined it, would have shown ... [t]hat ART would significantly impact Central's traffic, congestion, neighborhoods and shops." Id. But, plaintiffs argued, "[n]ot only did the FTA not give this data or the project itself a `hard look' as NEPA requires[,] the FTA seems to have given it no look at all." Id. As noted, the district court rejected this argument based upon the testimony presented at the evidentiary hearing. Because the argument that plaintiffs now assert — that it was impermissible for the FTA to rely exclusively on the City's submissions — was not made below and is being asserted for the first time on appeal, "we would be well within the boundaries of our discretion to decline to consider [it]." Fish, 840 F.3d at 730.

Even if we were to reach this new argument, we would conclude that it lacks merit. Notably, the primary case cited by plaintiffs in support of their argument, Van Abbema v. Fornell, 807 F.2d 633 (7th Cir. 1986), expressly recognizes that it is permissible for an agency to "rely on reports prepared by outsiders or applicants." Id. at 642. To be sure, Van Abbema also cautions that "when such [outside] information is specifically and credibly challenged as inaccurate, the [agency at issue] has an independent duty to investigate." Id. But the plaintiffs in this case did not challenge the City's report as inaccurate. Instead, as noted above, they argued that it actually supported their position. Moreover, the district court in this case found, after hearing testimony from an FTA official, that the FTA agreed with the City's report only after carefully and independently considering it. Thus, in the end, plaintiffs have failed to establish that the FTA was obligated to conduct its own, independent investigation, or that it otherwise acted improperly in relying on the City's report.

The only other challenge that plaintiffs mount to the district court's analysis of their NEPA-based claim is, as outlined in Issue III of their appellate brief, that the district court erred in concluding that the controversy regarding the ART Project did not involve environmental concerns. In support of this challenge, plaintiffs first point to 23 C.F.R. § 771.118, which is entitled "FTA categorical exclusions," and provides, in pertinent part, as follows:

23 C.F.R. § 771.118(a), (b)(2). Plaintiffs in turn point to 40 C.F.R. § 1508.27, which defines the term "significantly" for purposes of NEPA, and states, in pertinent part:

40 C.F.R. § 1508.27(b)(4), (5). Plaintiffs argue that "[t]he District Court apparently did not consider the mountain of extrinsic evidence regarding the intensity of the controversy surrounding ART, presumably because the City had not disclosed the controversy to the FTA and because the FTA had not included in the Administrative Record the many hundreds of communications it had received in opposition." Aplt. Br. at 35-36. Plaintiffs further argue that "[t]he District Court did not explain what could be considered `environmental' in the context of an urban BRT project, and ignored CEQ regulations that define environmental impacts as including `aesthetic, historic, cultural, economic, social, or health, whether direct, indirect, or cumulative.'" Id. at 36 (quoting 40 C.F.R. § 1508.8(b)).

The problem with plaintiffs' arguments is that they ignore the CEQ's definition of "human environment":

40 C.F.R. § 1508.14 (emphasis added). As we have noted in applying this definition, "[i]t is well-settled that socioeconomic impacts, standing alone, do not constitute significant environmental impacts cognizable under NEPA." Cure Land, LLC v. United States Dep't of Agric., 833 F.3d 1223, 1235 (10th Cir. 2016). Instead, only when an action "`will have primary impact on the natural environment'" will "`secondary socio-economic effects ... be considered.'" Id. at 1235 n.10 (quoting Image of Greater San Antonio v. Brown, 570 F.2d 517, 522 (5th Cir. 1978)). And that problem is fatal to the plaintiffs, for the vigorous public opposition to the ART Project that plaintiffs point to was clearly founded on concerns other than the impact the ART Project would have on the natural environment. More specifically, as the district court noted in rejecting plaintiffs' argument that there was a substantial controversy on environmental grounds, "the negative [public] comments" cited by plaintiffs concerned "cost, access to businesses, lost parking, removal of the median, and preferred alignments," none of which concerned the impact of the ART Project on the natural environment. App., Vol. 7 at 1059-60.

Thus, in sum, plaintiffs have failed to establish that the district court erred in analyzing the merits of their NEPA-based claim.

3) The NHPA-based claim

"NHPA, like NEPA, is a procedural statute requiring government agencies to stop, look, and listen before proceeding when their action will affect national historical assets." Presidio Historical Ass'n v. Presidio Trust, 811 F.3d 1154, 1169 (9th Cir. 2016) (quotation marks omitted). Of relevance here, Section 106 of NHPA "requires an agency undertaking a project expected to adversely affect a public or private site listed on the National Register of Historic Places to `take into account the effect of the undertaking on any historic property.'" Id. at 1168 (quoting 54 U.S.C. § 306108). In fulfilling this statutory obligation, a federal agency must also comply with relevant NHPA regulations. For example, the agency must take into account the area of potential effects (APE), which is defined as "the geographic area or areas within which an undertaking may directly or indirectly cause alterations in the character or use of historic properties, if any such properties exist." 36 C.F.R. § 800.16(d). The agency must also, as relevant, consult with the SHPO in identifying the area of potential effects and determining the likely effect of the undertaking at issue. See 36 C.F.R. §§ 800.4(a)-(c), 800.5(a), 800.6(a), 800.16(f).

We have emphasized that "[e]stablishing an [APE] requires a high level of agency expertise, and as such, the agency's determination is due a substantial amount of discretion." Valley Cmty. Pres. Comm'n, 373 F.3d 1078, 1092 (10th Cir. 2004).

In challenging the FTA's and the City's Section 106 analysis as arbitrary or capricious, plaintiffs voiced a number of arguments in the district court. To begin with, plaintiffs complained that the FTA and the City failed to consider the full impact of the ART Project. For example, they "complain[ed] that the FTA defined the APE too narrowly and [they] argue[d] that the ART [P]roject w[ould] `directly or indirectly cause alterations in the character or use of historic properties' beyond just the bus stations." App., Vol. 7 at 1060 (quoting 36 C.F.R. § 800.16(d)). In addition, plaintiffs "argue[d] that the FTA ignored the fact that the ART [P]roject w[ould] introduce `visual, atmospheric or audible elements' that w[ould] diminish the historical nature of properties." Id. (quoting 36 C.F.R. § 800.5(a)(2)(v)). Plaintiffs also argued that the City was required to "consider the cumulative impact of ART in determining whether ART w[ould] adversely affect historic resources." Id.

The district court rejected these arguments, stating as follows:

Id. at 1060-61.

The plaintiffs also complained "that the FTA did not provide the SHPO with the City's traffic study." Id. at 1061. The district court summarily rejected this argument, noting that "[t]he SHPO knew what the ART design would be, including median stations," and that the plaintiffs "ha[d] not sufficiently established how a study showing a diversion of 250 cars per day and possible increased congestion at intersections in 2035 would affect the SHPO's decision, which was based on a narrow APE and was concerned with visual issues." Id.

Lastly, plaintiffs argued below "that the FTA failed to engage the public or seek public comment as required by ... NHPA." Id. The district court rejected this argument, noting that "[t]he City ... conducted public outreach which provided an opportunity to allow comment under... NHPA." Id. at 1062. More specifically, the district court noted that "the outreach included numerous one-on-one contacts with the public, door hangers, neighborhood meetings, other public meetings, and various other modes of outreach." Id.

Now, in Issue VI of their appellate brief, plaintiffs argue that "[t]he District Court abused its discretion by disregarding the law and disputed record evidence supporting" their three arguments. Aplt. Br. at 42. To begin with, the plaintiffs argue that the district court "misread[] ... the governing law" in "uphold[ing] the FTA's `narrow' APE" on the grounds "that the [SHPO] concurred with the FTA on the scope of the APE." Id. at 43. According to plaintiffs, "[w]hether a SHPO concurs with the APE is not the applicable legal standard for assessing the legal sufficiency of the APE." Id. Instead, plaintiffs argue, 36 C.F.R. § 800.16(d) "requires the APE to be broad enough geographically to include `areas within which an undertaking may directly or indirectly cause alterations in the character or use of historic properties.'" Id. at 44 (quoting 36 C.F.R. § 800.16(d) (emphasis added by plaintiffs)). "Moreover," plaintiffs argue, 36 C.F.R. § 800.5(a)(1) "required the FTA to consider, [sic] not only indirect impacts, but also `reasonably foreseeable effects caused by the undertaking that may occur later in time, [or] be farther removed in distance or be cumulative.'" Id. (quoting 36 C.F.R. § 800.5(a)(1)). The district court, plaintiffs argue, "ignored the record evidence ... that the FTA defined the APE considering only direct impacts of the three small areas in the proximity of proposed ART stations," and it also "disregard[ed] the fact that there exists no evidence or even claims by Appellees that they ever considered indirect and cumulative impacts resulting from ART." Id. at 45 (emphasis in original).

The problem with plaintiffs' arguments is two-fold. First, plaintiffs are wrong in suggesting that the SHPO's concurrence in the APE carries no weight. Indeed, the applicable regulations require the FTA to consult with the SHPO in determining the APE, see 36 C.F.R. § 800.4(a), and we have expressly cited the fact of an SHPO's concurrence in upholding an APE, see Valley Cmty. Pres. Comm'n, 373 F.3d at 1091. Second, plaintiffs misread the record in asserting that the APE considered only the direct effects or impacts of the ART Project. The administrative record quite clearly establishes that the City and the FTA, with the concurrence of the SHPO, concluded that the ART Project would not have any direct effects or impact on historic properties. Thus, the APE focused on the indirect visual effects stemming from the ART Project, most notably the visual effects from the canopies of certain proposed bus stations. And the City modified the ART Project in certain respects to reduce the visual impacts of proposed ART stations in certain historic districts.

Plaintiffs next argue, as part of Issue VI, that the district court "abused its discretion by shifting the burden of assessing adverse effects onto [them]." Aplt. Br. at 48. According to plaintiffs, they "pointed out [below] that one of the adverse effects that the FTA failed to consider by limiting the APE to direct impacts around the areas of the ART stations was the diversion of traffic from Central Avenue to adjacent neighborhoods including [four] historic districts." Id. And that concern, plaintiffs argue, "is factually justified from the City's own traffic study, which predicts 200-250 vehicles during a single peak PM hour will be diverted from Central Avenue at Edith Boulevard and Locust Street," both of which "are parts of Huning Highland, a historic district on the National Register of Historic Properties." Id. at 48-49. Plaintiffs assert that the district court "misstated the traffic diversion as vehicles per day instead of vehicles during a single peak hour." Id. at 49 (emphasis in original). The district court also, plaintiffs argue, "misstate[d] [their] legal burden and the governing law by rejecting their concerns" about this diversion of traffic. Id. According to plaintiffs, "[t]here can be no legitimate dispute that the presence of diverted traffic into the adjacent historic districts will have some effect on them and the law required the FTA to consider whether such effects result in an `adverse effect.'" Id. at 50 (emphasis in original) (quoting 36 C.F.R. § 800.5). Because the FTA "did not consider traffic diversion at all," plaintiffs argue, "it is beyond dispute that the FTA did not define the APE with sufficient expansiveness to have considered and assessed these effects directly, indirectly, or cumulatively on the historic districts." Id. at 51.

Plaintiffs are possibly correct on one point: the district court did arguably misstate the data regarding the number of vehicles that would be diverted from Central Avenue by the ART Project. Although the district court stated that the diversion number would be 250 vehicles per day, the traffic modeling that was conducted by the City actually indicated that "[a] maximum of 250 vehicles during the PM peak hour (eastbound)" would be "divert[ed] from Central Avenue." App., Vol. 8 at 1153. It is unclear from the record whether any non-peak hour diversions would occur. Thus, the figure stated by the district court may or may not be correct.

The remainder of plaintiffs' arguments, however, must be rejected. To begin with, the arguments that plaintiffs now make regarding diverted traffic flow are nowhere to be found in the brief they filed in support of their motion for preliminary injunction. Instead, they argued in that brief that "the FTA inappropriately limited the APE to areas adjacent to bus stations," and "entirely disregarded ... destruction, alteration, character changes, and introduction of visual and atmospheric impact by the ART [P]roject." App., Vol. 2 at 222. Because plaintiffs' arguments regarding diverted traffic flow were not asserted below, we are under no obligation to address them for the first time in this appeal.

Moreover, even if we were to address these arguments, plaintiffs themselves misstate the record in suggesting that this diverted traffic would flow into, and negatively impact, four historic neighborhoods. To begin with, the City's traffic modeling suggested that a portion of the 250 vehicles would "shift to a time outside of the peak hour." Id. In other words, some of the 250 vehicles would not divert to other nearby roads at all, but instead would drive down Central Avenue at alternative times. Further, the City's traffic modeling indicated that the remainder of the 250 vehicles would divert "from Central Avenue to parallel arterial streets," most namely "the Lead Avenue/Coal Avenue one-way pair approximately ¼ mile south of Central Avenue, and Lomas Boulevard, a six-lane principal arterial north of Central Avenue." Id. And, the City's modeling indicated, "[a]ccording to volume-to-capacity data ..., Lomas Boulevard and Lead Avenue/Coal Avenue have adequate capacity to accommodate the traffic diverted from Central Avenue." Id. Finally, nothing in the record indicates that the traffic actually diverted from Central Avenue during the "PM peak hour" will "directly or indirectly cause alterations in the character or use of historic properties" on or near Central Avenue, as would be necessary to raise concerns under NHPA. 36 C.F.R. § 800.16(d) (defining APE).4 For these reasons, plaintiffs have failed to demonstrate a likelihood of establishing that the FTA erred in defining the APE, or that the district court erred in rejecting their arguments on this point.

Plaintiffs also argue, again as part of Issue VI, that the APE was inaccurate because the ART Project "will not remain within the existing roadway footprint" and instead will require the City to "acquir[e] over an acre of property from both private and public property owners." Aplt. Br. at 52. Relatedly, plaintiffs argue that the APE failed to take into account the fact that the ART Project will create "substantial subsurface disturbance with accompanying vibrational and noise impacts to historic buildings and districts along the ART route resulting from the construction of ART." Id.

These arguments were not asserted by plaintiffs in the brief they filed with the district court in support of their motion for preliminary injunction, and thus we are under no obligation to address them in this appeal. Even if we were to address these arguments, we would conclude that they lack merit because plaintiffs have failed to describe why the APE would have been any different had the City and the FTA considered these two factors (i.e., the need for the City to acquire approximately an acre of property to complete the ART Project, or the vibrational and noise impacts), and they also fail to establish that the FTA acted arbitrarily or capriciously in failing to consider these factors. Or, as the City aptly argues, these arguments "rel[y] on the absence of overt discussion of the issue and not on any evidence that [the acquisition of property by the City for the ART Project or the] temporary construction vibrations will in fact be a problem" in terms of negatively impacting historic properties. City Aplee. Br. at 51.

Plaintiffs next argue, as part of Issue VI, that it was an abuse of discretion for the district court to "defer[] to the conclusion of Jeff Fredine in his Cultural Inventory Addendum that Central Avenue/Route 66 is not eligible for placement on the National Register [of Historic Places]." Aplt. Br. at 53. Fredine's conclusion, plaintiffs argue, "rests on [his] gross mischaracterization of a survey carried out by Route 66 Historian, Dr. David Kammer." Id. To begin with, plaintiffs argue, the portion of Kammer's survey that Fredine relied on actually addressed a section of Route 66 that is outside of Albuquerque. Id. at 53-54. "To make matters worse," plaintiffs argue, "Kammer actually recommended [in his 2003 survey] that Route 66-related historic districts," such as those inside the Albuquerque city limits, "should be nominated for eligibility." Id. at 54 (emphasis in original).

Plaintiffs again mischaracterize the record in making these arguments. During his direct testimony at the evidentiary hearing, Fredine explained that he and the City

App., Vol. 24 at 3055. Fredine testified that, as "general background" material, id. at 3062, he relied on two surveys that Kammer had published, one in 1993 and an updated version in 2003, "document[ing] historic and architectural resources of Route 66 throughout New Mexico," id. at 3056. Fredine noted that neither survey "list[ed] Central [Avenue] or Route 66 through Albuquerque as a historic property or one that's eligible for the National Register [of Historic Places]." Id.

On cross-examination, Fredine acknowledged that the portion of Kammer's survey that he relied on addressed rural areas of Route 66. Id. at 3071. When asked why he relied on that part of the survey in reaching conclusions about an area of Route 66 located in the city limits of Albuquerque, Fredine explained:

Id. at 3072.

Fredine was asked on cross-examination to read a portion of Kammer's surveys that stated "the Route 66 Preservation Program and NR staff should collectively address the possibility of nominating Route 66-related historic districts in urban areas." Id. at 3073. Fredine was then asked whether Kammer was "saying something [in his surveys] that [wa]s quite different than what [Fredine] attributed to him in [his] report?" Id. at 3074. Fredine responded:

Id.

Thus, in sum, Fredine provided a rational explanation for the conclusion he reached in his report (i.e., that Route 66, as it ran through Albuquerque, did not qualify as a historic district for purposes of NHPA), and the district court did not abuse its discretion in relying on that testimony.

Finally, as part of Issue VI, plaintiffs argue that the district court abused its discretion by "disregard[ing] the record evidence establishing that neither the City nor the FTA consulted with the public in carrying out the Section 106 review." Aplt. Br. at 55. According to plaintiffs, "Section 106 regulations make planning for involving the public and actually engaging the public mandatory." Id. at 56 (citing 36 C.F.R. §§ 800.3(e), (f), 800.4). Yet, plaintiffs argue, "[n]o evidence exists that either the City or the FTA ever sought consultation from anyone other than tribes regarding impacts on historic properties." Id.

Plaintiffs' arguments lack merit. To be sure, the applicable regulation states that "[t]he views of the public are essential to informed Federal decisionmaking in the section 106 process." 36 C.F.R. § 800.2(d)(1). But, as the district court correctly noted, the "regulations do not specify the form of public outreach required under NHPA." App., Vol. 7 at 1061. Instead, the regulation affords the "agency official" with discretion to "seek and consider the views of the public in a manner that reflects," in pertinent part, "the nature and complexity of the undertaking and its effects on historic properties." 36 C.F.R. § 800.2(d)(1). Further, and of particular importance here, the regulation states that "[t]he agency official may use the agency's procedures for public involvement under [NEPA] ... if they provide adequate opportunities for public involvement consistent with this subpart." 36 C.F.R. § 800.2(d)(3).

Notably, the district court found, in rejecting these same arguments made by the plaintiffs, that "[t]he City ... conducted public outreach [that] provided an opportunity to allow comment under ... NHPA." App. at 1062. In making this finding, the district court credited the testimony of Michael Riordan, the City's Chief Operations Officer, who "testified the outreach included numerous one-on-one contacts with the public, door hangers, neighborhood meetings, other public meetings, and various other modes of outreach." Id. To be sure, the district court found "that some people did not get the word" and "[m]any of those that did ... do not believe they were heard." Id. Nevertheless, the district court found "that the City's submissions to the FTA included sizeable numbers of [public] comments," thereby allowing "[t]he FTA [reason to] conclude from the CE application that the City engaged in public outreach would have included comment required by ... NHPA." Id.

Plaintiffs fail to explain how the district court's factual findings on this issue were clearly erroneous. Moreover, plaintiffs make no attempt to undercut the testimony of Riordan regarding the measures that were taken to elicit public comment. Consequently, there is no merit to their argument that the district court abused its discretion in reaching the conclusion that it did.

In sum, then, plaintiffs have not established any error on the part of the district court in concluding that they failed to establish a substantial likelihood of success on the merits of their NHPA-based claim.

Irreparable harm

The district court concluded that plaintiffs failed to "satisf[y] the irreparable harm requirement for a preliminary injunction." App., Vol. 7 at 1064. In reaching this conclusion, the district court stated:

Id. at 1063-64.

In Issue IV of their appellate brief, plaintiffs argue that the district court abused its discretion in relying on the City's assertion "that the dedicated lanes could be repurposed as general traffic lanes." Aplt. Br. at 37. According to plaintiffs, this was merely a statement in the City's brief in opposition to plaintiffs' motion for preliminary injunction, and was "entirely without support in the evidence." Id.

Plaintiffs are correct that the City's brief in opposition to plaintiffs' motion for preliminary injunction stated, without a citation to any evidence: "As an initial matter, construction of ART would not impose any irreparable injury for the simple reason that the ART lanes could be redesignated as general purpose lanes or turn lanes, with relatively modest changes, were the Court to find the project impermissible on some basis on the merits." App., Vol. 4 at 564. The problem for plaintiffs, however, is that they failed to respond to this assertion in the reply brief that they filed with the district court in support of their motion for preliminary injunction. In that reply brief, plaintiffs briefly discussed the issue of irreparable harm, but made no mention of the City's assertion that the ART Project lanes could be redesignated if necessary. Consequently, plaintiffs have waived this argument for purposes of appeal.

Plaintiffs next argue in Issue IV of their appellate brief that the district court erred in concluding that their economic harms were "`compensable by monetary damages.'" Aplt. Br. at 37 (quoting App., Vol. 7 at 1063). According to plaintiffs, "[t]he District Court did not posit any legal theory on which [they] could recover damages," and "[o]ther courts have routinely rejected arguments that even a theoretical theory for recovery of damages for environmental harm can be treated as a substitute for injunctive relief in a NEPA case." Id. Plaintiffs further argue that the district court improperly criticized them for failing to provide "specific numbers or hard projections" regarding the economic damages they might suffer as a result of the ART Project. Id. at 38. And plaintiffs argue that the district court improperly "speculated that the ART [P]roject might well improve businesses and other aspects of life along Central [Avenue]." Id.

These arguments largely miss the central point of the district court's irreparable harm analysis. Having concluded that plaintiffs failed to establish a substantial likelihood of success on the merits of their NEPA and NHPA-based claims, the district court in turn concluded that the only potential harms identified by plaintiffs were largely economic in nature and mostly speculative at that. Under Tenth Circuit law, it is well established that "economic loss is usually insufficient to constitute irreparable harm." Crowe & Dunlevy, P.C. v. Stidham, 640 F.3d 1140, 1157 (10th Cir. 2011). Notably, plaintiffs make no attempt to demonstrate that this case is an exception to the general rule.

As for plaintiffs' assertion that the district court "speculated that the ART [P]roject might well improve businesses and other aspects of life along Central [Avenue]," what the district court actually said is that "the evidence indicate[d] that over all access w[ould] improve with ART." App., Vol. 7 at 1063. Plaintiffs make no attempt to challenge this assessment of the evidence.

For these reasons, we conclude that plaintiffs have failed to establish that the district court abused its discretion in concluding that plaintiffs failed to establish the existence of irreparable harm.

Balance of harms and public interest factors

The district court concluded that the balance of harms did not favor granting plaintiffs a preliminary injunction. In reaching this conclusion, the district court emphasized that "[p]laintiffs' harms ... reflect[ed] personal preferences, but ... d[id] not meet the legal test." Id. at 1065. "Furthermore," the district court noted, "not allowing ART to go forward w[ould] keep the City from building a project to revitalize the area and address pedestrian safety and improve transit efficiency." Id. In addition, the district court noted that "the evidence sufficiently indicate[d] that delaying ART w[ould] lead to increased construction costs [of up to $7,500 per day] because the City w[ould] have to pay its contractors to keep them mobilized during cold weather and for any period of delay caused by an injunction." Id. (quotation marks omitted). Lastly, the district court noted that "the City's ... construction schedule [wa]s such that it w[ould] minimize impacts to businesses and residents, especially during peak shopping times during Christmas, Summerfest, Balloon Fiesta, and State Fair." Id.

The district court also concluded "that the public interest require[d] denying an injunction." Id. at 1066. The district court explained that "[c]ompleting the ART [P]roject on time w[ould] address existing safety concerns sooner and save the public money due to construction delays," and that "an injunction w[ould], in part, serve Plaintiffs' private interests, i.e., their business and financial interests, rather than the public's interest at large." Id. The district court also "acknowledge[d] that at least a majority of the City Council, the Mayor, and other elected officials ha[d] investigated the ART [P]roject and ha[d] determined that it [wa]s in the public's interest." Id.

In Issue IV of their appellate brief, plaintiffs argue that the district court "misunderstood the `balance of harms' and `public interest' in the context of injunctive relief from NEPA violations." Aplt. Br. at 39. To begin with, plaintiffs argue that it was wrong for the district court to rely on the City's claim that it would lose $7,500 per day in contractual damages if an injunction were issued. In support, plaintiffs note that in Davis v. Mineta, 302 F.3d 1104, 1116 (10th Cir. 2002), we concluded, in the context of a NEPA-based claim, that delay costs that would be incurred by the Utah Department of Transportation (UDOT) if an injunction were issued in favor of plaintiffs "may [have] be[en] self-inflicted" by "state entities ... `jump[ing] the gun' on the environmental issues by entering into contractual obligations that anticipated a pro forma result." And the same is true in this case, plaintiffs argue, because "the City entered into contracts during the period that this Court had temporarily enjoined the City from proceeding." Aplt. Br. at 40 (emphasis in original).

But plaintiffs' arguments misstate the record in this case. On August 1, 2016, the same day the appeal was docketed, plaintiffs filed an emergency motion to stay the district court's order and for emergency injunctive relief pending consideration of their appeal. Later that same day, we issued an order directing the City and the FTA to file written responses to plaintiffs' emergency motion by August 2, 2016. The order also directed the City to "include in its response information on the nature and timing of any demolition or construction related to the ART project that is planned between now and the close of business on Wednesday, August 10, 2016." Order at 1. Lastly, the order temporarily enjoined defendants "from taking any action on the ART project until further order of the court." Id. at 2.

On August 2, 2016, the City filed a written response to plaintiffs' emergency motion, and also filed its own emergency motion for limited modification of the court's August 1, 2016 order. In both pleadings, the City explained that at approximately 8:30 a.m. on August 1, 2016, prior to the issuance of our order, "the City executed a contract for certain pre-construction work" that was "non-destructive and temporary in nature." City's Emergency Motion at 2. The City thus asked us to modify our August 1, 2016 order to allow this pre-construction work to begin. The City also stated in its response that, absent our issuance of an injunction, it intended to execute a contract authorizing construction work on August 22, 2016, and that it expected demolition or destructive work to start on September 3, 2016.

On August 2, 2016, we issued an order granting the City's emergency motion to modify the temporary injunction to allow the pre-construction work to proceed. Little more than two weeks later, on August 19, 2016, we issued an order denying plaintiffs' motion for stay and injunction pending appeal and vacating the temporary injunction that was entered on August 1, 2016.

In light of this procedural history, there is no merit to plaintiffs' assertion that the City entered into contracts during the period that we temporarily enjoined the City from proceeding. To the contrary, the City entered into the pre-construction contract prior to the issuance of our temporary injunction order, and it entered into the construction contract after we lifted the temporary injunction order and denied plaintiffs' motion for stay and injunction pending appeal.

Moreover, the key difference between Davis and the case at hand is that we concluded that the plaintiffs in Davis were likely to succeed on the merits of their NEPA claim, i.e., that UDOT officials erred in concluding that the highway construction project at issue would have no significant effect on the environment. Here, in contrast, plaintiffs have failed to establish a substantial likelihood of prevailing on either their NEPA-based claim or their NHPA-based claim. Thus, it was not necessarily improper in this context for the district court to take into account the additional costs that would be incurred by the City if an injunction were issued.

Lastly, plaintiffs argue, as part of Claim IV of their appellate brief, that "[a]s to the related `public interest' prong of the test for preliminary injunctive relief, this Court and others have consistently identified the strong public interest in the enforcement of NEPA." Aplt. Br. at 41. While that is true, the fact remains that plaintiffs have failed to establish a substantial likelihood of prevailing on the merits of their NEPA-based claim. Consequently, they have failed to establish that the public interest would be served if a preliminary injunction were entered in their favor.

III

We AFFIRM the district court's denial of a preliminary injunction and REMAND the case for further proceedings.