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Lake Powell at 13%

Published May 13, 2026 · Public Climate Science Network

The Colorado River is dying in public, and the numbers no longer require interpretation. Lake Powell — the nation’s second-largest reservoir, the linchpin of water and power for 40 million people across seven states — is forecast to receive 13% of normal spring runoff this year. That is the lowest inflow projection in the reservoir’s 63-year history. Since October 1, only 408,000 acre-feet of water has entered Powell. The full-year forecast is approximately 800,000 acre-feet — against a reservoir designed to hold 24.3 million. The water simply is not coming.

The Reservoir Right Now

As of this writing, Lake Powell sits at 23% capacity — roughly 5.6 million acre-feet of storage in a basin that holds 24.3 million. The surface elevation reads 3,526.40 feet. That number matters because of what lies below it: the minimum power pool elevation at Glen Canyon Dam is 3,490 feet. Below that line, water can no longer reach the turbines. Hydropower generation ceases entirely.

At current depletion rates, Powell could reach minimum power pool by September 2026. Glen Canyon Dam generates electricity for communities across the rural West — small towns, tribal nations, agricultural operations that have no ready alternative. When the turbines stop, the power doesn’t simply come from somewhere else. For many of these customers, it doesn’t come at all.

The Domino Downstream

The Bureau of Reclamation has already begun emergency measures. Planned releases from Powell have been cut from 7.48 million to 6.0 million acre-feet per year. Flaming Gorge Reservoir, upstream in Wyoming and Utah, is being tapped for an emergency release of 660,000 to 1 million acre-feet between April 2026 and April 2027 — a transfusion from one declining patient to another.

But cutting Powell’s releases means less water flowing downstream to Lake Mead, which is already in crisis. Mead sits at 1,053.69 feet — approximately 31% full. The arithmetic is stark: outflow from Mead is running at 20,179 cubic feet per second, while inflow is only 7,897 CFS. The reservoir is emptying more than twice as fast as it fills. Hoover Dam’s hydropower output could be cut by 40% by fall 2026 if Mead continues to drop.

The two reservoirs that anchor the Colorado River system — Powell and Mead, with a combined design capacity of nearly 50 million acre-feet — are being drained simultaneously. The emergency measures being taken to save one accelerate the decline of the other. There is no reservoir upstream of Flaming Gorge to bail out that system in turn.

The Negotiation Failure

This crisis has a deadline. The post-2026 operating rules that govern how Colorado River water is allocated among the seven basin states expire on October 1, 2026. After that date, there is no legal framework for who gets how much water. The states were supposed to negotiate replacement rules. They have failed twice.

The seven basin states missed the November 2025 deadline. They missed the February 2026 deadline. The fundamental dispute has not changed in a century: the upper basin states (Wyoming, Colorado, Utah, New Mexico) argue they should not bear disproportionate cuts to save downstream reservoirs; the lower basin states (California, Arizona, Nevada) argue that senior rights and population demand priority. Neither side will concede enough to close the gap.

If no agreement is reached, the Secretary of the Interior will impose operating rules unilaterally through a NEPA process. That has never happened on the Colorado River. The legal, political, and practical consequences of a federally imposed allocation — overriding a century of state-negotiated compacts — are without precedent.

The Rights That Precede Everyone

Absent from most of the negotiation coverage are the 22 tribal nations with senior water rights on the Colorado River. Under the Winters Doctrine (1908), tribal water rights predate all state allocations. Many of these rights have never been fully quantified, let alone delivered. As the river shrinks, the conflict between tribal priority rights and state consumption becomes unavoidable. Any unilateral federal allocation that ignores tribal sovereignty will face immediate legal challenge — and should.

What This Means for Fire

The Colorado River crisis is not separate from the wildfire crisis. It is the same crisis. The snowpack that feeds Powell is the same snowpack that keeps forests and grasslands hydrated through fire season. When April snowpack across the upper basin runs at 13% of normal, the forests downstream receive 13% of normal soil moisture. Vegetation stress rises. Dead fuel loads accumulate. Fire weather intensifies.

The hydropower losses compound the problem. When Glen Canyon and Hoover Dam reduce output, grid operators must find replacement generation — often natural gas plants that increase the carbon emissions driving the drought in the first place. The feedback loop does not close. It spirals.

Forty million people depend on a river that is receiving 13 cents of every dollar it was promised. The reservoirs are draining. The negotiations have failed. The deadline is October. And the mountains that were supposed to send water this spring are bare.

Sources

Colorado Sun, “Lake Powell forecast to receive lowest inflows on record,” 2026. Sierra Club, “Colorado River crisis deepens as Powell drops,” 2026. Utah Public Radio, “Flaming Gorge emergency release authorized,” April 2026. Denver University Water Law Review, “Post-2026 operating rules and tribal water rights,” 2026. Western Water Assessment, “Upper basin snowpack and inflow projections,” 2026. U.S. Bureau of Reclamation, Lake Powell and Lake Mead operational data, accessed May 2026. lakepowell.water-data.com, real-time elevation and storage data. lakemead.water-data.com, real-time elevation, inflow, and outflow data.