Basins
Basins
Storage and streamflow rolled up by western river basin.
Data through Aug 26, 2026 · updated Aug 27, 2026
Colorado (Lower) basin
Reservoir storage across Arizona / California / Nevada
9.21M af · Aug 25, 2026
-16% vs 5-yr median
Green-Colorado basin
Reservoir storage across Utah / Wyoming
2.89M af · Aug 25, 2026
-13% vs 5-yr median
Sacramento basin
Reservoir storage across California
2.92M af · Aug 26, 2026
-7% vs 5-yr median
San Joaquin basin
Reservoir storage across California
1.81M af · Aug 26, 2026
-5% vs 5-yr median