OPINION

NGUYEN, Circuit Judge:

John Sturgeon ("Sturgeon") challenges the National Park Service's ("NPS") enforcement of a regulation banning the operation of hovercrafts on the Nation River, part of which falls within the Yukon-Charley Rivers National Preserve. The ban prevented Sturgeon from using his personal hovercraft on his moose hunting trips on the Nation River. The State of Alaska intervened, challenging NPS's authority to require its researchers to obtain a permit before engaging in studies of chum and sockeye salmon on the Alagnak River, part of which falls within the boundaries of the Katmai National Park and Preserve.

Sturgeon and Alaska present the same legal argument: § 103(c) of the Alaska National Interest Lands Conservation Act ("ANILCA") precludes NPS from regulating activities on state-owned lands and navigable waters that fall within the boundaries of National Park System units in Alaska. The district court granted summary judgment in favor of the federal appellees. Because we find that Sturgeon's interpretation of § 103(c) is foreclosed by the plain text of the statute, we affirm as to Sturgeon. We hold that Alaska lacks standing to bring this challenge, and thus vacate and remand with instructions that Alaska's case be dismissed.

I.

The facts are straightforward and largely undisputed. Since 1971, Sturgeon has hunted moose on an annual basis on the Nation River.1 The lower six miles of the Nation River lie within the Yukon-Charley Rivers National Preserve ("Yukon-Charley"), which is a unit of the National Park System. In 1990, Sturgeon purchased a small, personal hovercraft, which he used on his hunting excursions. In September 2007, while repairing his hovercraft on a gravel bar adjoining the river, Sturgeon was approached by three NPS law enforcement employees. They informed him that NPS regulations prohibited the operation of hovercrafts within the Yukon-Charley and issued him a verbal warning. Sturgeon protested that the NPS regulations were inapplicable because he was operating his hovercraft on a state-owned navigable river. Sturgeon contacted his attorney via satellite phone, who in turn contacted Andee Sears, a Regional Law Enforcement Specialist with NPS. Sears told Sturgeon's attorney that the hovercraft must be removed from the Yukon-Charley. Sturgeon complied.

Later, Sturgeon followed up with Sears over the phone and met with him in Anchorage. Sears advised Sturgeon that even though Alaska might own the submerged land beneath the river, the hovercraft ban was nonetheless in force within the boundaries of the Yukon-Charley. Sears warned Sturgeon that he risked criminal liability if he operated his hovercraft within the Yukon-Charley. In response to these warnings, Sturgeon refrained from using his hovercraft during the 2008 to 2010 moose hunting seasons and has not been able to hunt on the portions of the Nation River that fall within the boundaries of the Yukon-Charley.

Although Sturgeon sent a letter to then-Secretary of the Interior, Ken Salazar, petitioning for repeal or amendment of the NPS regulations restricting his access to navigable waters located within national park boundaries, he did not receive a response. He then sued in federal district court, seeking an order declaring that NPS's regulations violated ANILCA, as applied to him on state-owned lands and waters, and enjoining the federal defendants from enforcing these regulations.

Alaska intervened, raising the same argument that the application and enforcement of NPS regulations on state-owned lands and waters violated ANILCA. Specifically, Alaska challenged NPS regulations that required employees of the Alaska Department of Fish and Game to obtain a scientific research and collecting permit before engaging in genetic sampling of chum and sockeye salmon on the Alagnak River. These regulations purportedly harmed Alaska "in the form of increased staff time and expense in complying with NPS procedures and in the form of delays in implementing the project." Alaska further argued that NPS's actions both interfered with its sovereign right to manage and regulate its lands and waters and chilled its citizens' ability to enjoy the rights and benefits flowing from its management of state resources.

On summary judgment, the district court ruled in favor of the federal appellees. Sturgeon v. Masica, No. 3:11-CV-0183-HRH, 2013 WL 5888230, at *9 (D.Alaska Oct. 30, 2013). The district court found that Sturgeon's and Alaska's interpretation of ANILCA § 103(c) lacks support in the plain language of the statute. Id. at *8-*9. This appeal followed.

II.

We review questions of law resolved on summary judgment de novo, and the district court's factual findings for clear error. Al Haramain Islamic Found., Inc. v. U.S. Dep't of Treasury, 686 F.3d 965, 976 (9th Cir.2012).

III.

As an initial matter, the federal appellees contend that we lack jurisdiction over this appeal because Sturgeon and Alaska have failed to establish standing. Even though the federal appellees did not present these arguments to the district court below, they may nonetheless do so for the first time on appeal. The constitutional requirements for standing under Article III are jurisdictional, cannot be waived by any party, and may be considered sua sponte. City of Los Angeles v. Cnty. of Kern, 581 F.3d 841, 845 (9th Cir.2009). The oft-repeated "irreducible constitutional minimum of standing contains three elements." Lujan v. Defenders of Wildlife, 504 U.S. 555, 560, 112 S.Ct. 2130, 119 L.Ed.2d 351 (1992). "First, the plaintiff must have suffered an `injury in fact,'" which is both concrete and particularized, as well as actual or imminent. Id. "Second, there must be a causal connection between the injury and the conduct complained of," meaning that the injury must be "fairly traceable to the challenged action of the defendant." Id. (quoting Simon v. Eastern Ky. Welfare Rights Org., 426 U.S. 26, 41-42, 96 S.Ct. 1917, 48 L.Ed.2d 450 (1976) (quotation mark and alterations omitted)). Third, it must be likely that a favorable decision would redress the injury identified. Id. at 561, 112 S.Ct. 2130.

Apart from these constitutional concerns, "there exists a body of `judicially self-imposed limits on the exercise of federal jurisdiction'" that forms the prudential standing doctrine. Cnty. of Kern, 581 F.3d at 845 (quoting Allen v. Wright, 468 U.S. 737, 751, 104 S.Ct. 3315, 82 L.Ed.2d 556 (1984)); see also Sprint Commc'ns Co., L.P. v. APCC Servs., Inc., 554 U.S. 269, 289-90, 128 S.Ct. 2531, 171 L.Ed.2d 424 (2008). Because these considerations are nonconstitutional in nature, they may be deemed waived if not previously raised before the district court. Cnty. of Kern, 581 F.3d at 845.

A.

We find that Sturgeon has established standing. The federal appellees argue that Sturgeon has failed to show probable or imminent enforcement of the NPS regulations to meet the first requirement of an injury-in-fact. The federal appellees' view, however, cannot be reconciled with the Supreme Court's recent decision in Susan B. Anthony List v. Driehaus, ___ U.S. ___, 134 S.Ct. 2334, 189 L.Ed.2d 246 (2014), where the Court emphasized that threatened enforcement actions may suffice to create Article III injuries. "When an individual is subject to such a threat, an actual arrest, prosecution, or other enforcement action is not a prerequisite to challenging the law." Id. at 2342. Thus, "a plaintiff satisfies the injury-in-fact requirement where he alleges `an intention to engage in a course of conduct arguably affected with a constitutional interest, but proscribed by a statute, and there exists a credible threat of prosecution thereunder.'" Id. (quoting Babbitt v. Farm Workers Nat'l Union, 442 U.S. 289, 298, 99 S.Ct. 2301, 60 L.Ed.2d 895 (1979)).

Sturgeon has satisfied the injury-in-fact requirement. He has alleged an intention to use his hovercraft, and has contacted both NPS and the Department of the Interior regarding the applicability and enforcement of the regulation to his hovercraft use. Sturgeon's inability to use his hovercraft for moose-hunting purposes arguably implicates his right under the Privileges or Immunities Clause of the Fourteenth Amendment "to use the navigable waters of the United States, however they may penetrate the territory of the several States." The Slaughter-House Cases, 83 U.S. 36, 79, 16 Wall. 36, 21 L.Ed. 394 (1872); see also Courtney v. Goltz, 736 F.3d 1152, 1160 (9th Cir.2013) (interpreting the Privileges or Immunities Clause to encompass "a right to navigate the navigable waters of the United States"). Sturgeon thus alleges "an intention to engage in a course of conduct arguably affected with a constitutional interest." Susan B. Anthony List, 134 S.Ct. at 2342 (quoting Babbitt, 442 U.S. at 298, 99 S.Ct. 2301).

Further, there is no dispute that his intended conduct is proscribed by NPS regulation. See 36 C.F.R. § 2.17(e) (stating that "[t]he operation or use of hovercraft is prohibited" within NPS-administered lands and waters, which include the Yukon-Charley). Finally, "there exists a credible threat of prosecution thereunder." Susan B. Anthony List, 134 S.Ct. at 2342 (quoting Babbitt, 442 U.S. at 298, 99 S.Ct. 2301). The federal appellees concede that Sturgeon received a verbal warning not to use the hovercraft, that Special Agent Sears told Sturgeon's lawyer that Sturgeon "should remove the hovercraft from the preserve," and that Sears later indicated that Sturgeon "[might] be subject to criminal liability if he operated a hovercraft in the preserve."2 These facts are sufficient to show a credible threat of enforcement against Sturgeon.

Next, the federal appellees argue that any injury-in-fact identified by Sturgeon is not "fairly traceable" to actions of NPS. We disagree. The regulation was promulgated by NPS and enforcement has been threatened by NPS employees. Therefore, Sturgeon's injuries are "fairly traceable" to actions of NPS. Finally, a favorable decision would redress Sturgeon's identified injury-in-fact, and the federal appellees do not contend otherwise.

In addition to contending that Sturgeon lacks Article III standing, the federal appellees argue that prudential considerations of ripeness and adverseness militate against a finding of standing. However, the federal appellees failed to raise these arguments before the district court. We thus find them waived, as prudential standing arguments "can be deemed waived if not raised in the district court" due to their nonconstitutional nature.3 Cnty. of Kern, 581 F.3d at 845 (quoting Bd. of Natural Res. v. Brown, 992 F.2d 937, 946 (9th Cir.1993)) (internal quotation marks omitted).

B.

The State of Alaska, on the other hand, lacks standing. Alaska offers three bases to support its standing: (1) harm "in the form of increased staff time and expense" in obtaining and complying with the terms of a scientific research and collecting permit; (2) injuries to Alaska's sovereign right to control its lands and waters; and (3) the Secretary of the Interior's denial of its petition for administrative proceedings that would repeal or amend the regulations at issue. We address each of the proffered bases in turn.

With regard to Alaska's chum and sockeye salmon study, the increased burdens to Alaska as a result of NPS's permit requirement clearly constitute injuries-in-fact. It is undisputed that NPS employees informed Alaska's Department of Fish and Game ("DFG") that a scientific research and collecting permit was required before it engaged in the study. The scientific research and collecting permit that DFG actually obtained and the General Conditions and Park Specific Guidance that accompanied it-all of which are part of the record-demonstrate that DFG was forced to comply with numerous obligations and limitations under the terms of the permit. To name just a few, DFG was not allowed to destroy research specimens without NPS's prior authorization, was obligated to catalogue collected specimens into NPS's Interior Collections Management System and label such specimens with NPS accession and catalog numbers, and was required to submit an Investigator's Annual Report and copies of other final reports and publications resulting from the study within a year of publication. The record thus amply supports Alaska's allegation of harm in the form of increased staff time and expense.

But while Alaska may have suffered cognizable injuries, a favorable ruling would not redress these injuries. Alaska's complaint sought a declaration that the NPS regulations were invalid and void as applied to state-owned lands and waters and an injunction barring future enforcement of the regulations on state-owned lands and waters. Such relief would not remedy injuries relating to DFG's chum and sockeye salmon study in 2010, which have already been incurred and suffered. At oral argument, Alaska represented that DFG's chum and sockeye salmon study is complete, and the record offers no indication that related studies or efforts are pending or forthcoming. In the absence of evidence showing how the requested relief would redress its identified injuries, Alaska may not rely on activities relating to the 2010 study of chum and sockeye salmon to establish standing. Cf. Lujan, 504 U.S. at 564, 112 S.Ct. 2130 ("Past exposure to illegal conduct does not in itself show a present case or controversy regarding injunctive relief ... if unaccompanied by any continuing, present adverse effects." (alteration in original)) (quoting Los Angeles v. Lyons, 461 U.S. 95, 102, 103 S.Ct. 1660, 75 L.Ed.2d 675 (1983)) (internal quotation marks omitted).

The second basis proffered by Alaska presents a closer question. Alaska argues that the NPS regulations violate its "sovereign[]" and "proprietary interests" in its lands and waters, and interfere with its "authority and ability to manage its property in accordance with the Alaska Constitution and state law." States certainly possess sovereign and proprietary interests that may be pursued via litigation. Alfred L. Snapp & Son, Inc. v. Puerto Rico ex rel. Barez, 458 U.S. 592, 601-02, 102 S.Ct. 3260, 73 L.Ed.2d 995 (1982); see also, Pennsylvania v. New Jersey, 426 U.S. 660, 665, 96 S.Ct. 2333, 49 L.Ed.2d 124 (1976) ("It has ... become settled doctrine that a State has standing to sue only when its sovereign or quasi-sovereign interests are implicated...."). However, we conclude that Alaska's arguments are unavailing for purposes of establishing standing under the circumstances of this case.

To begin with, Alaska failed to meet the requirement that its purported injuries be "actual or imminent." Lujan, 504 U.S. at 560, 112 S.Ct. 2130 (quoting Whitmore v. Arkansas, 495 U.S. 149, 155, 110 S.Ct. 1717, 109 L.Ed.2d 135 (1990)) (internal quotation mark omitted). Because Alaska did not identify any actual conflict between NPS's regulations and its own statutes and regulations, we are left with only a vague idea of how exactly NPS's permitting requirement infringes on the state's sovereign and proprietary interests in its lands and waters, or how the requirement interferes with the state's control over and management of those lands and waters. In the absence of such a conflict, Alaska's purported injuries are too "conjectural or hypothetical" to constitute injuries-in-fact. Id. (quoting Whitmore, 495 U.S. at 155, 110 S.Ct. 1717) (internal quotation marks omitted).

Alaska has cited no case that finds standing based simply on purported violations of a state's sovereign rights. Rather, evidence of actual injury is still required. For example, in Massachusetts v. EPA, 549 U.S. 497, 127 S.Ct. 1438, 167 L.Ed.2d 248 (2007), the Supreme Court found that Massachusetts had standing to challenge the EPA's denial of a rulemaking petition requesting regulation of greenhouse gas emissions under the Clean Air Act. Id. at 510-11, 526, 127 S.Ct. 1438. The Court noted that the state was due "special solicitude in [the] standing analysis" based on two factors: (1) Massachusetts sought to vindicate a procedural right, which eliminated the need under Article III to demonstrate redressability and immediacy, and (2) Massachusetts's status as a "sovereign State." Id. at 517-20, 127 S.Ct. 1438; see also Washington Envtl. Council v. Bellon, 732 F.3d 1131, 1144-45 (9th Cir.2013) (distinguishing Massachusetts v. EPA). Even in light of this special solicitude, however, the Court specifically found that "[b]ecause the Commonwealth `own[ed] a substantial portion of the state's coastal property,' it ha[d] alleged a particularized injury in its capacity as a landowner" due to rising global sea levels. Massachusetts, 549 U.S. at 522, 127 S.Ct. 1438 (citation omitted).

Similarly, in Oregon v. Legal Services Corp., 552 F.3d 965 (9th Cir.2009), Oregon contended that a private, nonprofit corporation established by the United States to provide federal funds to local legal assistance programs "thwart[ed][its] efforts at policy making with regards to Oregon's Legal Service Program." Id. at 973. We rejected Oregon's claim because "there [was] no dispute over Oregon's ability to regulate its legal services program, and no claim that Oregon's laws ha[d] been invalidated as a result of the [corporation's] restrictions." Id. Because Oregon was able "to regulate its legal service programs as it desire[d]," there was thus "no judicially cognizable injury." Id. at 974.

Finally, Nevada v. Burford, 918 F.2d 854 (9th Cir.1990), is also illustrative. Nevada challenged the Bureau of Land Management's decision to grant a right-of-way over state-owned land to the Department of Energy. Id. at 855. Because Nevada's complaint was "silent as to how [the Bureau's] alleged violations ... resulted in injury to Nevada," in the absence of demonstrated injury, its claim "`constitute[d] a generalized grievance that the [Bureau] [was] not acting in ... accordance' with federal laws" and was thus "insufficient to demonstrate standing." Id. at 856-57 (first, third, and fourth alterations added, second alteration in original) (quoting Nevada v. Burford, 708 F.Supp. 289, 295 (D.Nev.1989)). See also Table Bluff Reservation (Wiyot Tribe) v. Philip Morris, Inc., 256 F.3d 879, 883 (9th Cir.2001) (finding no injury-in-fact where twenty Native American tribes challenged a Master Settlement Agreement between Philip Morris, Inc. and forty-six states, five territories, and the District of Columbia because the tribes identified no tribal regulations or contracts that would be affected by the Agreement).

Similarly, here, Alaska's claims regarding its sovereign and proprietary interests lack grounding in a demonstrated injury. While Alaska alleges that NPS regulations "have directly interfered with Alaska's ability as a sovereign to manage and regulate its land and waters," Alaska identifies no conflict between NPS regulations and its own state statutes and regulations.4 Any injury to Alaska's sovereign and proprietary interest is pure conjecture and thus insufficient to establish standing.

The third and final basis upon which Alaska relies to establish standing is the Secretary of the Interior's denial of its petition for new administrative proceedings. A plaintiff possesses standing to enforce procedural rights "so long as the procedures in question are designed to protect some threatened concrete interest of his that is the ultimate basis of his standing." Lujan, 504 U.S. at 573 n. 8, 112 S.Ct. 2130. As discussed above, Alaska fails to identify any "threatened concrete interest." Alaska cannot rely on the Secretary's denial of its petition because "[p]articipation in agency proceedings is alone insufficient to satisfy judicial standing requirements." Gettman v. Drug Enforcement Admin., 290 F.3d 430, 433 (D.C.Cir.2002) (quoting Fund Democracy, LLC v. SEC, 278 F.3d 21, 27 (D.C.Cir. 2002)) (internal quotation marks omitted). Alaska's "right to petition the agency does not in turn `automatic[ally]' confer Article III standing when that right is deprived." Id. (alteration in original) (quoting Pet'rs' Br.).

Therefore, we hold that Alaska has failed to establish standing to challenge the NPS regulations. We vacate the district court's judgment as to Alaska and remand with instructions that Alaska's case be dismissed for lack of jurisdiction.

IV.

We now turn to the merits of Sturgeon's challenge. Sturgeon contends that § 103(c) of ANILCA bars the application and enforcement of NPS's hovercraft ban on the Nation River,5 which he contends is state-owned land. According to Sturgeon, the plain text of the statute, its legislative history, and our decision in City of Angoon v. Marsh, 749 F.2d 1413 (9th Cir.1984), support his view. Before explaining why we find Sturgeon's contentions unpersuasive, we offer a bit of background.

A.

ANILCA, enacted in 1980, offered new "protection[s] for the national interest in the scenic, natural, cultural and environmental values on the public lands in Alaska, and at the same time provide[d] adequate opportunity for satisfaction of the economic and social needs of the State of Alaska and its people." 16 U.S.C. § 3101(d). Summarized succinctly, "ANILCA is generally concerned with the designation, disposition, and management of land for environmental preservation purposes." Stratman v. Leisnoi, Inc., 545 F.3d 1161, 1165 (9th Cir.2008). To this end, Congress "set aside approximately 105 million acres of federal land in Alaska for protection of natural resource values by permanent federal ownership and management." Nat'l Audubon Soc'y v. Hodel, 606 F.Supp. 825, 827-28 (D.Alaska 1984). Portions of those lands were used to expand existing units of the National Park System and create new units, which were to be administered by the Secretary of the Interior. 16 U.S.C. § 410hh; id. § 410hh-1. Such units included national parks, preserves, and monuments. See 16 U.S.C. § 410hh; id. § 410hh-1. ANILCA refers to units of the National Park System situated in Alaska as "conservation system unit[s]" ("CSUs"). 16 U.S.C. § 3102(4).

Not all lands that lie within the boundaries of a CSU are owned by the federal government. Where possible, Congress drew unit boundaries "to include whole ecosystems and to follow natural features," and was thus cognizant of the fact that state, Native, or private-owned land could fall within the boundaries of CSUs. Marsh, 749 F.2d at 1417 (quoting 125 Cong. Rec. 9905 (1979)). The presence of both federal-owned and nonfederal-owned land lying within CSUs led Congress to clarify two things: first, what land would actually comprise the CSUs, and second, more generally, how land falling within a CSU's boundaries — whether federally owned or not — could be regulated. See id. (discussing the House version of ANILCA and the "Tsongas substitute" in the Senate).

Such clarification came in ANILCA § 103(c). The full text of that subsection reads as follows:

16 U.S.C. § 3103(c).

Section 103(c) thus contains three separate instructions regarding the composition and regulation of CSUs. First, only "public lands" lying within the boundaries of a CSU are "deemed to be included as a portion of such unit." Id. Under ANILCA, "public lands" are "[f]ederal lands" (including "lands, waters, and interests therein") in which the United States holds title after December 2, 1980. Id. § 3102(1)-(3). The first sentence of § 103(c) makes clear that the boundaries of CSUs "do[] not in any way change the status of that State, native, or private land" lying within those boundaries. 125 Cong. Rec. 11158 (1979).

The second sentence of § 103(c) declares that state, Native, and private-owned land shall not be subject to "regulations applicable solely to public lands within such units." 16 U.S.C. § 3103(c). Accordingly, under § 103(c)'s plain text, only public land lying within a CSU's boundaries may be subjected to CSU-specific regulations — nonfederal land is expressly made exempt from such regulations. As the 1979 Senate Report on ANILCA makes clear, nonfederal land would not be "subject to the management regulations which may be adopted to manage and administer any national [CSU] which is adjacent to, or surrounds, the private or non-federal public lands." S.Rep. No. 96-413, at 303 (1979), reprinted in 1980 U.S.C.C.A.N. 5070, 5247 (emphasis added). Importantly for purposes of this case, in contrast to CSU-specific regulations, "[f]ederal laws and regulations of general applicability to both private and public lands" are "unaffected," and "would be applicable to private or non-federal public land holdings within [CSUs]." Id.

Finally, § 103(c)'s third sentence provides that the Secretary of the Interior may acquire nonfederal land lying within a CSU's boundaries; such land would then "become part of the unit" and may "be administered accordingly." 16 U.S.C. § 3103(c). Once acquired, what was previously nonfederal land would no longer be free from "regulations applicable solely to public lands within [CSUs]." Id.; see also 126 Cong. Rec. 21882 (1980) (noting that "if the [Native-]corporations ever decide to dispose of their property, [it] could become part of the [CSU]").

B.

With this background in mind, we easily resolve Sturgeon's appeal. Sturgeon argues that the plain language of ANILCA § 103(c) removes nonfederal lands from the reach of federal regulations promulgated to manage public lands. Thus, his argument goes, NPS may not enforce the hovercraft ban on the lower portion of the Nation River that falls within the Yukon-Charley because the water and submerged land of that river is owned by the state of Alaska.

While we agree with Sturgeon that § 103(c) is unambiguous, we find that it unambiguously forecloses his interpretation. The plain text of § 103(c) only exempts nonfederal land from "regulations applicable solely to public lands within [CSUs]." 16 U.S.C. § 3103(c) (emphasis added). The regulation at issue, banning hovercraft use in the Yukon-Charley, is not so limited.

In 1976, Congress vested the Secretary of the Interior with the authority to "[p]romulgate and enforce regulations concerning boating and other activities on or relating to waters located within areas of the National Park System, including waters subject to the jurisdiction of the United States." 16 U.S.C. § 1a-2(h). Pursuant to this grant of authority, the Secretary promulgated a number of regulations to "provide for the proper use, management, government, and protection of persons, property, and natural and cultural resources within areas under the jurisdiction of the National Park Service." 36 C.F.R. § 1.1(a). Within the chapter of the Code of Federal Regulations containing those regulations, parts 1 through 5 "apply to all persons entering, using, visiting, or otherwise within" federally owned lands and waters administered by NPS and "[w]aters subject to the jurisdiction of the United States located within the boundaries of the National Park System, including navigable waters." 36 C.F.R. § 1.2(a)(1), (3). The hovercraft ban is located within part 2 of that chapter. See 36 C.F.R. § 2.17(e).

In short, then, the hovercraft ban is not one that "appli[es] solely to public lands within [CSUs]" in Alaska. 16 U.S.C. § 3103(c). Rather, this regulation applies to all federal-owned lands and waters administered by NPS nationwide, as well as all navigable waters lying within national parks. Thus, even assuming (without deciding) that the waters of and lands beneath the Nation River have been "conveyed to the State" for purposes of § 103(c), that subsection does not preclude the application and enforcement of the NPS regulation at issue. Because of its general applicability, the regulation may be enforced on both public and nonpublic lands alike within CSUs. Though Sturgeon might prefer a more robust regulatory exemption, we "must presume that a legislature says in a statute what it means and means in a statute what it says." Barnhart v. Sigmon Coal Co., Inc., 534 U.S. 438, 461-62, 122 S.Ct. 941, 151 L.Ed.2d 908 (2002) (quoting Conn. Nat'l Bank v. Germain, 503 U.S. 249, 253-54, 112 S.Ct. 1146, 117 L.Ed.2d 391 (1992)).6

C.

Sturgeon acknowledges that § 103(c)'s language exempts nonfederal lands from regulations applicable "solely" to public lands, but argues that overreliance on the word "solely" leads to a result contrary to the express legislative purpose of restricting federal authority over nonfederal land within CSUs. "When confronted with a statute which is plain and unambiguous on its face, we ordinarily do not look to legislative history as a guide to its meaning." Tennessee Valley Auth. v. Hill, 437 U.S. 153, 184 n. 29, 98 S.Ct. 2279, 57 L.Ed.2d 117 (1978); see also Balen v. Holland Am. Line Inc., 583 F.3d 647, 653 (9th Cir.2009) (quoting North Dakota v. United States, 460 U.S. 300, 312, 103 S.Ct. 1095, 75 L.Ed.2d 77 (1983)) (internal quotation mark omitted) (stating that when statutory language is clear, its "language must ordinarily be regarded as conclusive"). But even if we consider the legislative history of ANILCA, we find no support for Sturgeon's claim. Rather, the legislative records from the House and Senate contain numerous statements supporting the plain language of the statute. The sponsor of § 103(c) in the House offered the view that his amendment "restate[d] and ma[de] clear" that nonfederal lands within CSUs would not be "subject to regulations which are applied to public lands which, in fact, are part of the unit." 125 Cong. Rec. 11158 (1979). The primary sponsor of ANILCA in the House declared that nonfederal land would not be constrained by "regulations applicable to the public lands within the specific conservation system unit." 125 Cong. Rec. 9905 (1979). The House Concurrent Resolution that added § 103(c) to ANILCA specified that "only public lands (and not State or private lands) are to be subject to the [CSU] regulations applying to public lands." 126 Cong. Rec. 30498 (1980). Finally, the Senate Report notes that § 103(c) would exempt nonfederal land from "regulations which may be adopted to manage and administer any [CSU] which is adjacent to, or surrounds, the private or non-Federal public lands." S.Rep. No. 96-413, at 303 (1979), reprinted in 1980 U.S.C.C.A.N. 5070, 5247.7 Rather than help Sturgeon, the legislative history confirms that ANILCA § 103(c) did not purport to exempt nonfederal lands within CSUs from generally applicable federal laws and regulations like the hovercraft ban.

D.

Next, Sturgeon argues that our decision in City of Angoon v. Marsh, 749 F.2d 1413 (9th Cir.1984), supports his interpretation. Sturgeon's reliance on Marsh, however, is misplaced. Marsh involved the interaction between two subsections of ANILCA § 503. The first, § 503(b), established the Admiralty Island National Monument, which was composed of 921,000 acres "of public lands." Id. at 1416 (emphasis omitted) (quoting ANILCA, Pub.L. No. 96-487, § 503(b), 94 Stat. 2371 (1980)). The second, § 503(d), stated that "[w]ithin the Monument[], the Secretary shall not permit the sale of [sic] harvesting of timber." Id.

Reading these two subsections in conjunction, we held that the district court erred in finding that "all lands within the boundaries of a National Forest System Monument" — including private lands — "come within the harvesting prohibition of section 503(d)." Id. (emphasis omitted). We pointed out that under § 503(b), the Admiralty Island National Monument, "by definition, consists solely of public or federally owned lands." Id. Thus, § 503(d)'s use of the phrase "[w]ithin the Monument" was inapplicable "to private lands which are within the boundaries of a national forest conservation system unit." Id. (emphasis added and omitted).

Marsh clearly is inapposite to the present dispute. First, Marsh's discussion of § 103(c) is largely dicta because that subsection was inapplicable to the timber harvesting ban at issue. While ANILCA § 103(c) refers to "regulations applicable solely to public lands within such units," § 503(d) imposes a statutory prohibition against timber harvesting. At most, Marsh drew inferences from § 103(c) for the purpose of determining the reach of § 503(d). See id. at 1418 (noting that the court examined sections 102, 103(c), 503(d), and 506(c) "harmoniously" to determine Congressional intent regarding the ban on timber harvesting). Second, Marsh offers little guidance in Sturgeon's case because, if promulgated as a regulation, § 503(d)'s ban on timber harvesting would fall under § 103(c)'s exception to the application of regulations applying solely to public lands, while NPS's hovercraft ban does not. Section 503(d) specifically refers to activities taking place "[w]ithin the Monument[]," and thus only limits conduct taking place on public lands within a specific CSU. For that reason, if promulgated as an agency regulation, its harvesting ban would qualify as a "regulation[] applicable solely to public lands within [CSUs]," and would be unenforceable on state, Native, or private-owned land under ANILCA § 103(c). As we noted above, NPS's hovercraft ban is not so constrained, and it applies to federally owned lands and waters administered by NPS nationwide, as well as navigable waters within national parks.

V.

We reject two additional arguments asserted by Sturgeon, that the Secretary of the Interior exceeded her statutory authority in promulgating the regulation at issue and that her action raises serious constitutional concerns.

A.

The 1976 Park Service Administration and Improvement Act ("1976 Act") grants the Secretary of the Interior broad authority over boating and water-related activities within the National Park System. That authorization provides as follows:

16 U.S.C. § 1a-2(h). Sturgeon contends that the latter portion of this subsection restricts the Secretary's regulatory power and does not permit her to regulate any and all activities on waters within national parks.

However, the plain text of the 1976 Act merely requires that any regulations promulgated by the Secretary complement, and not derogate, Coast Guard authority over waters subject to federal jurisdiction. It does not, as Sturgeon argues, limit the Secretary's regulatory authority to that enjoyed by the Coast Guard. The Oxford English Dictionary defines "complement" to mean "to supply what is wanting," 3 Oxford English Dictionary 610 (2d ed.1989), and "derogate" to mean to "diminish," id. at 504. Thus, under the 1976 Act, the Secretary may regulate boating and other water-related activities taking place within the National Park System and its navigable waters so long as those regulations supplement and do not diminish the Coast Guard's authority.8

Indeed, the legislative history of the 1976 Act makes this clear. The concern regarding the regulatory authority of the Coast Guard was first raised by the Secretary of the Interior in a letter to the House Committee on Interior and Insular Affairs.9 H.R.Rep. No. 94-1569, at 13 (1976), reprinted in 1976 U.S.C.C.A.N. 4290, 4299. The Secretary noted that the Coast Guard possessed existing authority to "promulgate and enforce regulations for the promotion of safety of life and property on... waters subject to the jurisdiction of the United States." Id. (alteration in original) (emphasis added) (quoting 14 U.S.C. § 2(3)). Because many waters within the National Park System were navigable, the Secretary noted that his agency would "exercise authority concurrent with the Coast Guard in many instances," and thus recommended an amendment clarifying that the bill's grant of regulatory authority would "not diminish the Coast Guard's authority under existing law to regulate boat design and safety." Id. The remainder of the bill would still, however, grant her the authority "to regulate recreational, commercial and other uses and activities relating to all waters of the National Park System." Id. (emphasis added).

The statute reflects just such a clarifying amendment. See 16 U.S.C. § 1a-2(h). Thus, both the plain text and the legislative history of the 1976 Act make clear that Sturgeon's argument that the Secretary of the Interior exceeded her statutory authority is without merit.

B.

Finally, Sturgeon contends that the Secretary's exercise of her regulatory authority under the 1976 Act implicates "serious constitutional concerns." Specifically, he raises the specter of potential violations of the Property and Commerce Clauses, though without offering any specifics as to how or why the NPS regulations contravene those clauses. We therefore decline to invalidate NPS's hovercraft ban on constitutional grounds because "[w]hatever the extent of the State's proprietary interest in [its] river[s], the pre-eminent authority to regulate the flow of navigable waters resides with the Federal Government." New England Power Co. v. New Hampshire, 455 U.S. 331, 338 n. 6, 102 S.Ct. 1096, 71 L.Ed.2d 188 (1982); see also Alaska v. United States, 545 U.S. 75, 116-17, 125 S.Ct. 2137, 162 L.Ed.2d 57 (2005) (Scalia, J., concurring in part and dissenting in part) ("If title to submerged lands passed to Alaska, the Federal Government would still retain significant authority to regulate activities in the waters of Glacier Bay by virtue of its dominant navigational servitude, other aspects of the Commerce Clause, and even the treaty power.").

VI.

We hold that even assuming that the waters of and lands beneath the Nation River have been "conveyed to the State" for purposes of ANILCA § 103(c), NPS's hovercraft ban is not a regulation that applies solely to public lands within CSUs in Alaska. Therefore, as to Sturgeon, we affirm the district court's grant of summary judgment in favor of the federal appellees. Because Alaska cannot establish standing on this record, we vacate the district court's judgment as to Alaska and remand with instructions that Alaska's action be dismissed for lack of subject matter jurisdiction.

AFFIRMED IN PART, VACATED AND REMANDED IN PART.