Lake Powell Delivery Decline: Study Warns of 52% Drop

Water deliveries from Colorado's vital West Slope river basins to Lake Powell face a projected decline of up to 52 percent below their median levels by midcentury. This significant reduction, detailed in a recent study, stems from a combination of persistent drought, altered snowmelt timing, and growing water demand. The study focused on key basins that typically supply about 70 percent of Lake Powell's inflows.

Researchers employed advanced exploratory modeling, simulating over two million years across 20,000 plausible scenarios. These scenarios incorporated varied hydrologic futures, shifts in snowmelt, and fluctuating demands from municipal, industrial, and agricultural users. The findings indicate that major West Slope reservoirs could also experience substantial storage reductions, impacting their capacity to buffer shortages.

The findings emerge as the broader Colorado River system grapples with severe stress, with system storage already critically low. Projections suggest Lake Powell could fall below its minimum power pool level, threatening water and power reliability for millions.