Colorado River Water Crisis Deadlines Loom in 2026

Why It Matters

The clock is ticking on Colorado River water management, and Congress may now have less time to take effective action. A Congressional Research Service report updated May 18 lays out the full scope of the Colorado River water crisis in stark terms. The river is over-allocated, the reservoirs are shrinking, and the legal framework that has governed the basin for nearly two decades expires at the end of 2026. What happens next will affect 40 million people across seven states and Mexico.

The agreements that currently govern how water is rationed from the Colorado River, namely the 2007 Interim Guidelines, the 2019 Drought Contingency Plans, and the 2023 near-term conservation measures, all expire December 31, 2026. The U. S. Bureau of Reclamation (USBR) is conducting an environmental impact process to establish a new framework, with a final decision targeted before October 1. But the states can't agree, the administration hasn't signaled a preferred path, and most of the viable post-2026 options require Congress to act.

If Congress doesn't move, the Secretary of the Interior may be forced to manage the river using only existing authorities, foreclosing more flexible tools that could distribute the pain more equitably across the basin.

The Big Picture

The Colorado River Compact of 1922 divided the river's water between the Upper Basin states (Colorado, Wyoming, Utah, and New Mexico) and Lower Basin states (Arizona, Nevada, and California), allocating 7.5 million acre-feet annually to each. A 1944 treaty added 1.5 million acre-feet for Mexico. The problem is that those allocations were based on an assumed average annual flow of 16.4 million acre-feet. The actual average from 1906 to 2024 was approximately 14.6 million acre-feet. From 2000 to 2024, flows averaged just 12.4 million acre-feet per year.

Consumptive use, meanwhile, was approximately 13.3 million acre-feet in 2024. The gap between supply and demand is what the report calls a "structural deficit," and it has been draining the basin's two primary reservoirs, Lake Mead and Lake Powell, for more than two decades.

The situation has become acute. USBR warned in April 2026 that without major interventions, including 660,000 acre-feet to 1 million acre-feet in additional releases from Flaming Gorge Reservoir and 1.48 million acre-feet in reduced releases from Glen Canyon Dam, Lake Powell could fall below the minimum power pool level by August 2026, threatening hydroelectric generation at the dam. That level, 3,490 feet above sea level, is the minimum elevation needed to run the dam's hydroelectric plant. If it's breached, power supply to millions of customers in Upper Basin states would be at risk.

A 2023 study cited in the report estimated that stabilizing the system would require a 13 to 20 percent reduction in basin-wide use, or 2.4 to 3.2 million acre-feet per year below 2020 consumption levels. None of the alternatives currently under consideration in the draft environmental impact statement fully meet that threshold under all conditions.

Agriculture is the dominant driver of consumption. A 2024 study found that from 2000 to 2019, approximately 52 percent of basin waters were consumed by agricultural irrigation, with cattle-feed crops, primarily alfalfa and hay, accounting for 47 percent of direct human consumptive use.

The Post-2026 Fight

In January 2026, USBR released a draft environmental impact statement with five alternatives for post-2026 operations. None included a preferred option. The alternatives range from a "Basic Coordination" approach that could be implemented under existing law, to more expansive frameworks that would require new congressional authority and could impose maximum Lower Basin delivery reductions of 3 to 4 million acre-feet per year.

The draft drew more than 18,000 public comments, and the states involved were not pleased, though for very different reasons.

Lower Basin states argued the draft "shifts the full burden of drought response on the Lower Basin," per California's comments, and criticized the lack of mandatory Upper Basin water conservation. Upper Basin states countered that the alternatives "violate" the Law of the River by prioritizing Lower Basin uses and said only one alternative, specifically the most limited one, could be implemented without significant new congressional authority.

On May 1, the Lower Basin states submitted a new short-term proposal for 2026 through 2028, calling for 1.25 million acre-feet per year in reductions plus a new 700,000 acre-foot conservation program funded by an unspecified federal and state cost-share. The Upper Basin responded by calling for basin-wide mediation.

USBR stated in February 2026 that it would move forward on post-2026 guidelines without full state consensus, if necessary.

Tribal Rights Add Complexity to Colorado River Federal Policy

Layered into the Colorado River federal policy debate is the unresolved question of tribal water rights. There are 30 federally recognized tribes in the basin, and tribal water rights are often senior to other uses. As of December 2020, tribes held diversion rights to approximately 3.4 million acre-feet per year, though they were using just over half that amount. Eleven tribes still have unquantified reserved water rights claims.

In the 119th Congress, S. 953 and H.R. 2025 would authorize a major settlement of Colorado River water rights for the Navajo Nation, the Hopi Tribe, and the San Juan Southern Paiute Tribe, with $5 billion in authorized federal contributions and a $1.7 billion pipeline project required to be completed by 2040. Any expansion of tribal water use, whether through new settlements or development of existing rights, would reduce availability for other users in an already stressed system.

Political Stakes

For the Administration

Secretary of the Interior Doug Burgum faces a decision of historic consequence. The administration has broadly favored deregulation and deference to states, but the Colorado River may require the opposite, with the Secretary acting as the federal water master and potentially imposing cuts on states and contractors without their full agreement.

The administration's posture toward Inflation Reduction Act-funded conservation programs, which provided $4 billion for drought mitigation and formed the backbone of recent near-term water savings, adds another layer of tension. A 2026 Inspector General audit found a lack of public transparency in how those funds were disbursed.

For Republicans

Several GOP members from Arizona, including Reps. Andy Biggs and Paul Gosar, have already written to Secretary Burgum expressing dissatisfaction with the draft environmental impact statement. H.R. 7078, introduced in the 119th Congress, would amend the Colorado River Basin Project Act to remove Arizona's subordinate delivery priority and instead require pro rata shortage distribution, a significant shift in how cuts would be allocated.

For Democrats

Senators Mark Kelly and Ruben Gallego also wrote to Secretary Burgum in March 2026 with concerns about the draft, reflecting bipartisan anxiety over the current trajectory. H.R. 231 and S. 154 would extend the System Conservation Program, which has been a key voluntary conservation tool and is assumed to continue in some form under three of the four action alternatives.

For the Public

The drought-stricken Colorado River provides municipal water to nearly 40 million people, irrigates 5.5 million acres of farmland, and generates up to 4,200 megawatts of electricity annually. A compact call, which is an unprecedented legal mechanism by which Lower Basin states could attempt to force deliveries from Upper Basin states, has gone from theoretical to plausible. If it happens, it would trigger litigation and federal intervention on a scale the basin has never seen.

The Bottom Line

The Colorado River water crisis has been building for more than two decades, and 2026 could be the year a reckoning arrives. The legal framework expires, the reservoirs are low, and the states are not close to agreement. Congress has a narrow window of months, not years, to act on new authorities before the Secretary of the Interior is left managing the river with whatever tools are already on the shelf.

The report makes clear that significant water delivery reductions are coming regardless of which path is chosen. The question is who bears them, how much, and whether federal dollars will cushion the blow.

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