Basins
Below normalColorado (Lower) basin
Reservoir storage across Arizona / California / Nevada
Data through Aug 25, 2026 · source last checked Aug 27, 2026 · page revised Aug 27, 2026
Cite
- Lake Havasu
- Lake Mead
- Lake Mohave
About this data
- Source
- US Bureau of Reclamation RISE; California reservoirs via CA DWR CDEC
- Series
- Reservoir storage summed across the basin
- Geography
- Colorado (Lower) basin
- Unit
- acre-feet
- Calculation
- Daily reading
- Last observation
- Aug 25, 2026
- Update frequency
- Daily
Now 9.21M af, 16% below the 5-yr median.
Lower Colorado basin storage stands at 9.21M af, down 10.8% year-over-year and 16% below the 5-year median. Storage fell 0.4% on the week and 1.8% on the month.
| Period | Current | Prior | Change |
|---|---|---|---|
| Week over week | 9.21M af | 9.24M af | -0.4% |
| Month over month | 9.21M af | 9.37M af | -1.8% |
| Year over year | 9.21M af | 10.32M af | -10.8% |
| vs 5-yr median | 9.21M af | 10.90M af | -15.5% |
Previous weeks
Week of Aug 19, 2026
Colorado (Lower) basin storage stands at 9.23M af, down 10.3% year over year. The basin sits 15% below the 5-year median and shed 1.9% over the past month.
An earlier week
Lower Colorado basin storage stands at 9.25M af, down 10% year over year. The aggregate is 15% below the 5-year median.
Week of Aug 13, 2026
Lower Colorado basin storage at 9.28M af, down 9.7% from last year and 14% below the 5-year median. Storage has declined 2.3% this month.