Lake Powell forecast at 13% of flows

Lake Powell is the Colorado River system’s giant savings account — and this year the deposit is barely coming. Federal forecasters now think the reservoir will get just 13% of its normal April-through-July inflow, which would be the worst spring runoff into Powell since the lake filled behind Glen Canyon Dam in the 1960s. That matters because Powell is not just a big lake for boaters. It is one of the main control points for water deliveries, dam operations, and hydropower across the West. ### What actually got worse? The new number comes from the Colorado Basin River Forecast Center’s May 1 forecast. It shows just 800,000 acre-feet of unregulated inflow reaching Lake Powell from April through July — 13% of average. The full water-year forecast is 3.271 million acre-feet, or 34% of average, which is still awful but less shocking than the spring runoff figure because the snowmelt season is where Powell usually gets its big refill. (cbrfc.noaa.gov) ### Why is spring runoff the big deal? Because this is the money season. Snow piles up in the Upper Colorado Basin through winter, then melts in spring and early summer and rushes downstream into Powell. If that pulse collapses, the reservoir misses the one part of the year when it can meaningfully recover. Turns out this is not just a “dry month” story — it means the basin’s core snowmelt engine underperformed when it mattered most. (cbrfc.noaa.gov) ### How low is the lake right now? Reclamation’s Glen Canyon Dam page showed Lake Powell at the end of March at elevation 3,527.99 feet, with 5.72 million acre-feet in storage — about 25% of live capacity. That is roughly 172 feet below full pool. Some recent coverage rounds that to about 23% to 25% full, but the basic picture is the same: the lake is already low before the weakest runoff on record has even fully played out. (cbrfc.noaa.gov) ### Why does hydropower keep coming up? Because Glen Canyon Dam needs enough water height to push water through turbines. The key line is 3,490 feet — “minimum power pool.” Below that, the dam cannot generate hydropower. Reclamation said in April that, under its minimum probable inflow case, Powell could fall below 3,490 feet by August 2026 without major intervention. That does not mean shutdown is locked in, but it means the buffer is thin and shrinking. (usbr.gov) ### Could officials do anything to stop that? Yes — but mostly by moving pain around. Reclamation has already been adjusting Glen Canyon releases to protect Powell’s elevation, and recent emergency planning has centered on possible upstream transfers from other Colorado River reservoirs. That can buy time. But it does not create new water. Basically, it is like shifting money between checking accounts when the paycheck itself came in short. (usbr.gov) ### What about boating and marinas? Low water hits recreation fast because ramps, docks, and marinas stop lining up with the shoreline. The National Park Service is already warning visitors that changing lake levels affect ramp functionality, and Bullfrog Marina has been preparing relocations for the 2026 season. So even if the headline is about runoff, the practical effect shows up in where people can launch, fuel, and move around the lake this summer. (usbr.gov) ### Why does this matter beyond one reservoir? Because Powell and Mead are the backbone of stored water on the Colorado River, and the seven basin states are still fighting over the rules that replace the current system after 2026. A runoff year this bad strengthens the Upper Basin argument that future rules have to track actual hydrology more closely. The catch is that everyone already knows the river carries less water than the legal promises built on top of it. This forecast just makes that mismatch harder to dodge. (nps.gov) ### Bottom line? This is not just another bad water year. It is a stress test for the whole Colorado River system — dam operations, power generation, recreation, and interstate water politics all at once. If the spring refill really lands near 13% of average, Lake Powell goes into the second half of 2026 with almost no cushion left. (cbrfc.noaa.gov) (watereducationcolorado.org)