Lake Mead Water Level
The largest reservoir in the United States by capacity, formed by Hoover Dam. Lake Mead supplies Las Vegas, central Arizona, Southern California, and Mexico.
USBR daily reading for Oct 24, 2026
- PERCENT FULL
- 26.1%
- 7-DAY CHANGE
- +0.1 pts
- ELEVATION
- n/a
- ACRE-FEET
- 6.82M
- of 26.12M capacity
- GALLONS
- 2222.60B
- of 8511.24B
Water balance, 7 days to Oct 24, 2026
- Inflow
- n/a
- Reclamation's measured inflow
- Release
- 101,021 af
- Water passed downstream through the dam
- Change in storage
- n/a
- From the daily storage readings; the difference from inflow minus release is evaporation, diversions and rounding
Trend
- 7 days
- +0.1 pts
- vs. the reading a week earlier
- 1 year
- −5.4 pts
- vs. end of Sep 2025 (31.5%)
- 10-year low
- 26.1%
- end of Sep 2026
- 10-year high
- 44.4%
- end of Mar 2020
Yearly figures and the high/low compare end-of-month storage from Reclamation's monthly series with the latest daily reading. This site does not project future levels; for official 24-month projections see Reclamation's 24-Month Study. How each figure is derived is explained in the FAQ.
10-Year Historical Trend
End-of-month storage as a percent of capacity. Source: U.S. Bureau of Reclamation. Dashed lines are this site's warning (40%) and critical (25%) marks.
About Lake Mead
Lake Mead is on the Colorado River in NV/AZ. Reclamation's capacity figure for it is 26,120,000 acre-feet (USBR available capacity), about 8511.24B gallons.
The largest reservoir in the United States by capacity, formed by Hoover Dam. Lake Mead supplies Las Vegas, central Arizona, Southern California, and Mexico.
As of Oct 24, 2026, the reservoir held 6,820,887 acre-feet, 26.1% of capacity, up 0.1 pts from the reading seven days earlier. Storage figures are U.S. Bureau of Reclamation daily readings; recent values are provisional and may be revised.
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Every Monday: Lake Mead and the rest of the system, with the week's change. One email a week, unsubscribe any time.