Basins
Basins
Storage and streamflow rolled up by western river basin.
Data through Aug 12, 2026 · updated Aug 13, 2026
Colorado (Lower) basin
Reservoir storage across Arizona / California / Nevada
9.25M af · Aug 12, 2026
-15% vs 5-yr median
Green-Colorado basin
Reservoir storage across Utah / Wyoming
2.93M af · Aug 12, 2026
-13% vs 5-yr median
San Joaquin basin
Reservoir storage across California
1.86M af · Aug 12, 2026
-6% vs 5-yr median
Sacramento basin
Reservoir storage across California
3.10M af · Aug 12, 2026
-5% vs 5-yr median