Upper Colorado River Basin Compact

Upper Colorado River Basin Compact
Name	Upper Colorado River Basin Compact
Date signed	1948
Location signed	Santa Fe, New Mexico
Parties	Colorado, New Mexico, Utah, Wyoming, Arizona
Effective	1949
Context	Allocation of Colorado River waters among Upper Basin states

Upper Colorado River Basin Compact The Upper Colorado River Basin Compact is a 1948 interstate compact allocating waters of the Colorado River among the Upper Basin states and coordinating development, storage, and delivery related to the Colorado River Compact (1922), Boulder Canyon Project Act, and Colorado River Storage Project. Negotiated by representatives of Colorado River Water Conservation District, U.S. Bureau of Reclamation, and state engineering offices of Colorado, New Mexico, Utah, and Wyoming, the Compact established apportionments, administrative mechanisms, and obligations that interact with federal projects such as Glen Canyon Dam and statutory frameworks including the Water Supply Act and wartime-era water law precedents. The Compact has shaped litigation before the United States Supreme Court, influenced interstate compacts like the Decree of the Upper Colorado River Commission, and remains central to discussions involving National Park Service river corridors and tribal claims by Navajo Nation and Ute Indian Tribe.

Background and Negotiation

Negotiations leading to the Compact involved delegations from Colorado, New Mexico, Utah, and Wyoming meeting with officials from the U.S. Department of the Interior, the U.S. Bureau of Reclamation, and counsel tied to the original Colorado River Compact (1922), driven by competing projects like the Colorado River Storage Project and debates at the Senate Committee on Irrigation and Reclamation. Key influencers included state engineers, attorneys general of Colorado and Utah, and representatives of the Metropolitan Water District of Southern California and the Arizona Department of Water Resources who monitored Upper Basin negotiations because of downstream delivery obligations established under the Boulder Canyon Project Act. The negotiations referenced prior interstate accords such as the Rio Grande Compact and federal decisions in cases like Arizona v. California as precedents for apportionment, compact ratification, and congressional consent processes.

Terms and Provisions

The Compact apportioned an average annual flow of 7,500,000 acre-feet among the Upper Basin states, subject to measurement and accounting administered by the Upper Colorado River Commission and coordinated with the Secretary of the Interior. Provisions required water use accounting, guaranteed delivery obligations to the Lower Colorado River Basin under the Colorado River Compact (1922), and authorized storage projects including Blue Mesa Reservoir and Navajo Reservoir under the Bureau of Reclamation's authority. The Compact established methods for measuring diversions at key gaging stations such as those operated by the U.S. Geological Survey and created dispute-resolution mechanisms invoking the Supreme Court of the United States for interstate controversies while recognizing congressional consent pursuant to the Compact Clause.

Member States and Allocations

Member states party to the Compact are Colorado, New Mexico, Utah, and Wyoming, each receiving fixed allocations expressed in acre-feet apportioned from the Upper Colorado River Basin, with flexibility for transfers and conjunctive use administered by the Upper Colorado River Commission. The Compact’s allocation scheme interacts with downstream entitlements of Arizona, Nevada, and California under the Colorado River Compact (1922) and federal statutes like the Boulder Canyon Project Act, affecting municipal suppliers such as the Denver Water Board and regional agencies including the Salt River Project. Tribal water interests represented by the Navajo Nation, Ute Mountain Ute Tribe, and other Native American entities contend with Compact allocations in adjudications before state courts and the United States District Court.

Implementation and Administration

Implementation has been carried out by the Upper Colorado River Commission in coordination with the U.S. Bureau of Reclamation, state water engineers of Colorado, New Mexico, Utah, and Wyoming, and federal agencies including the Bureau of Indian Affairs and the Environmental Protection Agency for water quality concerns. The Commission oversees measurement protocols at USGS gages, operation of reservoirs like Glen Canyon Dam and Flaming Gorge Reservoir, and compliance with interstate delivery obligations enforced through litigation in the Supreme Court of the United States and administrative reviews by the Secretary of the Interior. Project financing and construction involved entities such as the Public Works Administration historically and contemporary coordination with regional utilities including the Central Utah Water Conservancy District.

Legal Challenges and Litigation

The Compact has been the subject of disputes litigated before the Supreme Court of the United States, including cases addressing apportionment, enforcement, and tribal claims, often alongside major suits like Arizona v. California. Challenges have involved state parties (Colorado v. Arizona-type disputes), federal agency actions by the U.S. Bureau of Reclamation, and claims by Navajo Nation and Ute Indian Tribe in federal courts and in negotiations under the Indian Claims Commission. Litigation has tested Compact terms against doctrines established in decisions such as Kansas v. Colorado and impacted ancillary statutes including the Endangered Species Act when species protections affect reservoir operations.

Environmental and Water Resource Impacts

The Compact influenced large-scale construction of storage and hydroelectric projects including Glen Canyon Dam and Blue Mesa Reservoir, reshaping river ecology in reaches through Grand Canyon National Park and affecting species protected under the Endangered Species Act such as humpback chub, while water operations intersect with conservation efforts by organizations like The Nature Conservancy and agencies like the National Park Service. Altered flow regimes impacted riparian habitats, sediment transport, and recreational economies in communities like Moab, Utah and Grand Junction, Colorado, prompting integrated resource management involving the U.S. Fish and Wildlife Service, state wildlife agencies, and regional river commissions.

Amendments and Subsequent Agreements

Amendments and related accords include agreements coordinated by the Upper Colorado River Commission, secretarial orders by the Secretary of the Interior, and later compacts and multi-state agreements such as the Colorado River Basin Project Act and the Drought Contingency Plan, with implementation ties to the Lower Colorado River Basin States and tribal settlements like those negotiated with the Navajo Nation. Successive federal legislation and interstate compacts have adapted Compact operations to changing hydrology documented by the National Oceanic and Atmospheric Administration and shifted management under contemporary agreements involving the Bureau of Reclamation and state water agencies.

Category:Colorado River Category:Interstate compacts of the United States