Before the McCarran Amendment was enacted, the United States could not be joined in state water court adjudications without its consent. See Bell, 724 P.2d at 640–1. Because of the prevalence of federal reserved water rights, particularly in the western United States, it was thought that state court procedures for the allocation and determination of water rights were being thwarted by the inability of state courts to ascertain or adjudicate federal water rights with finality. Id. at 641. As a result, meaningful stream adjudications proceeded only when the United States consented to participate. See John E. Thorson, State Watershed Adjudications: Approaches and Alternatives, 42 Rocky Mtn. Min. L. Inst. 22–1, 22–13 (1996).
9 In 1952, Congress enacted the McCarran Amendment, allowing state courts to involuntarily join the United States as a necessary party in comprehensive state adjudications of water rights. 43 U.S.C. § 666. The legislative history of the McCarran Amendment reveals its dual purposes: 1) to promote certainty and finality, and 2) to avoid needless waste or controversy by requiring the federal government to assert any and all claims to the use of water in a comprehensive state adjudication of water rights. See S.Rep. No. 82–755, at 4–6 (1951). Subsequent cases from the United States and Colorado Supreme Courts implementing the McCarran Amendment have confirmed these parameters and purposes. See, e.g. Colo. River Water Conservation Dist. v. United States, 424 U.S. 800, 807–08, 96 S.Ct. 1236, 47 L.Ed.2d 483 (1976); United States v. Dist. Court, 401 U.S. 520, 525, 91 S.Ct. 998, 28 L.Ed.2d 278 (1971) (Eagle County II ); Bell, 724 P.2d at 641–42; United States v. Dist. Court, 169 Colo. 555, 563–65, 458 P.2d 760, 763–64 (Colo.1969) (Eagle County I ).
10 It is clear both from the language of the amendment itself, as well as its legislative history and interpretive precedent that, although McCarran proceedings are intended to be all-inclusive, the waiver of sovereign immunity is limited to proceedings to determine or administer the rights to the use of the water. Colorado River, 424 U.S. at 819, 96 S.Ct. 1236. By its terms, the McCarran Amendment provides:
*1080 Consent is given to join the United States as a defendant in any suit (1) for the adjudication of rights to the use of water of a river system or other source, or (2) for the administration of such rights, where it appears that the United States is the owner of or is in the process of acquiring water rights by appropriation under State law, by purchase, by exchange, or otherwise, and the United States is a necessary party to such suit. The United States, when a party to any such suit, shall (1) be deemed to have waived any right to plead that the State laws are inapplicable or that the United States is not amenable thereto by reason of its sovereignty, and (2) shall be subject to the judgments, orders, and decrees of the court having jurisdiction, and may obtain review thereof, in the same manner and to the same extent as a private individual under like circumstances ....
43 U.S.C. § 666 (emphasis added). The McCarran Amendment does not assert or imply that a state court would have jurisdiction to review the decision making process of federal entities, such as Interior or the Park Service, for compliance with federal law.
Indeed, such a conclusion would run contrary to the Administrative Procedure Act, the federal statute which establishes the practices and procedures followed by administrative agencies in rulemaking and adjudication. The language and legislative history of the APA's judicial review provisions make clear that Congress intended to hold federal administrative agencies answerable for their conduct only in federal courts. 5 U.S.C. §§ 702, 706 (2004). Section 706 provides that a reviewing court shall “compel agency action unlawfully withheld or unreasonably delayed.” 5 U.S.C. § 706(1). Section 702 defines the scope of that review: “A person suffering legal wrong because of agency action, or adversely affected or aggrieved by agency action within the meaning of a relevant statute” is entitled to judicial review and may bring suit against the agency. 5 U.S.C. § 702. However, the suit must be brought “in a court of the United States.” Id. Thus, the waiver of sovereign immunity is expressly limited to federal court. See id.; see also Aminoil USA v. Calif. State Water Res. Control Bd., 674 F.2d 1227, 1233 (9th Cir.1982). The APA's legislative history underscores this intent, explicitly stating that the United States will remain immune from suit in state courts. Nat'l State Bank of Elizabeth v. Gonzalez, 266 N.J.Super. 614, 630 A.2d 376, 381 (A.D.1993) (citing H.R.Rep. No. 94–1656, at 11 (1976), U.S.Code Cong. & Admin.News 1976 at pp. 6121, 6131).
The scope of the waiver of sovereign immunity under the McCarran Amendment is not so broad that it allows state courts to evaluate or adjudicate the federal agency decision making processes leading the United States to make a particular water application in a given case. The Environmental Opposers have brought claims in federal court that can only be decided by that court. Thus, there is no question that there will be both state and federal proceedings before the United States' reserved water right for the Black Canyon can be fully resolved. The federal case will decide whether the United States' amended application complied with the applicable federal law, and the state case will quantify the reserved water right. We recognize that the federal case may have an impact on the water court proceeding. Indeed, if the federal case had no impact on the state case, there would be no need for a stay. However, the water court will decide the quantification of the federal reserved right even if the federal court finds that the agency decision making was flawed and must be redone.
The only question remaining is whether the water court's decision to stay the proceedings and allow the federal case to be resolved first constituted an abuse of discretion. To answer this question, we examine the standard for determination of a stay, and consider whether the water court met it.
In re Application for Water Rights of U.S., 101 P.3d 1072, 1079-80 (Colo. 2004)