Potholes Reservoir water level today
Reservoir in Washington
1,033.13ft
314.90 m · NAVD88
Measured · provisional
24 hours
▲ 0.02 ft
7 days
▲ 1.68 ft
30 days
–
What this means
The lake has risen 1.68 ft in 7 days.
Since 2026, the lowest daily level was 1,029.77 ft (Oct 2026) and the highest 1,033.13 ft (Oct 2026).
Potholes Reservoir level chart
Loading chart…
Measured
Normal range for the date (middle 50% of past years)
Records & details
- Highest
- 1,033.13 ft on Oct 21, 2026
- Lowest
- 1,029.77 ft on Oct 7, 2026
- Records from
- 2026 (0 years of daily data)
- Storage
- 106,896 acre-ft
- Water temperature
- Not measured here
O'sullivan Dam
- Height
- 200 ft
- Completed
- 1949
- Purposes
- Flood Risk Reduction; Irrigation; Navigation; Hydroelectric
- Owner
- BUREAU OF RECLAMATION
- Normal storage
- 511,700 acre-ft
- Surface area
- 27,800 acres
National Inventory of Dams (U.S. Army Corps of Engineers). All dam facts →
Weather & wind
Overnight45°F · Partly Cloudy
Wind NW 14 to 17 mph
Wind NW 14 to 17 mph
Friday60°F · Sunny
Wind NW 5 to 17 mph
Wind NW 5 to 17 mph
Friday Night35°F · Mostly Clear then Areas Of Frost
Wind N 3 mph
Wind N 3 mph
Saturday55°F · Areas Of Frost then Mostly Sunny
Wind SE 3 mph
Wind SE 3 mph
Saturday Night37°F · Mostly Cloudy
Wind N 1 to 5 mph
Wind N 1 to 5 mph
Sunday55°F · Partly Sunny then Chance Rain Showers
Wind N 1 to 5 mph
Wind N 1 to 5 mph
NOAA National Weather Service forecast for this lake's location, updated 12 h ago.