Water & Drought
Western Water Crisis
11 states. Map: 39 major reservoirs; state totals: 328 reservoirs with a current value (NRCS AWDB, CDEC, USBR). Each figure shows its as-of date.
The map shows the latest storage for each reservoir; dates are in the popups. Very low 2026 snowpack meant little snowmelt to refill them; recovery depends on the coming winter’s snowpack.
Drought destroys like fire, just slower. When reservoirs empty and allocations get cut, crops fail, ranchers sell herds, rural economies collapse, and ecosystems that took decades to establish die in a single summer. The 2021 Klamath Basin shutdown, zero irrigation for 1,200 farms, cost $344M in a single season. Drought does not make headlines the way fire does, but it makes ghost towns.
Arizona’s state total includes all of Lake Powell and Lake Mead (49.5 of 55.1 million acre-feet of Arizona capacity, 28.3% of corridor capacity), although Powell lies mostly in Utah and Mead is shared with Nevada. Without them, Arizona’s other reservoirs are at 57.7%.
Storage as of late August to September 30, 2026: some reservoirs report only monthly NRCS AWDB values (dated 2026-08), so state percentages mix monthly and daily readings. Lake Powell is 22.1% of the 23.31 million acre-feet usable capacity used here (21.1% of the older 24.32 million acre-feet figure).
April 1 snowpack determines summer water supply. In snowmelt-dominated western basins, April 1 SWE explains 50–80% of April–July runoff (Li et al. 2017). Low April 1, 2026 snowpack therefore meant a smaller summer supply; current storage is shown in the map and charts above.
Current storage, supply-forecast and water-use figures are shown in the map and charts above, each with its source and as-of date.
A new draw on the same water
As reservoirs fall, a fast-growing consumer is moving into the same arid basins: data centers. A single hyperscale facility can use millions of gallons a day for cooling, and AI workloads are accelerating demand—often in Arizona, Nevada, Utah, and eastern Oregon and Washington. Read: Data Centers & Water →
Reservoir storage: NRCS AWDB (BOR network), USBR RISE and HDB, CA DWR CDEC; as-of dates are shown on each chart and map. Water use: carried over from the May 2026 file, reported as USGS Circular 1441 (2015); not re-verified. Map: 39 major reservoirs; state totals: 328 reservoirs, 11 states. Snowpack: NRCS SNOTEL (about 900 stations).