Current level
1,030.21ft
−16.79 ft vs full pool
Low
Vs full pool
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Potholes Reservoir is currently at 1030.21 ft, 16.79 ft below full pool. The current Potholes Reservoir lake level fell 0.19 ft since the last reading and remains down 1.30 ft over the past seven days.
Potholes Reservoir is 16.79 ft below full pool, and its current lake level has fallen 1.30 ft over the past seven days.
1030.21 ft · Updated 47 hours ago · USBR (Columbia Basin Project, O'Sullivan Dam)
Current level
1,030.21ft
−16.79 ft vs full pool
Low
Vs full pool
Since last reading
Previous readingAug 211,030.4 ft
7-day change
7-day trend: Falling
8 daily readings in the last 7 days
30-day change
31 daily readings in the last 30 days
Selected for low water conditions. Water levels are running well below full pool, so navigation and shallow-water awareness gear is especially useful right now.
Water levels are running well below full pool, so navigation and shallow-water awareness gear is especially useful right now.
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Elevation (ft) NGVD29 · MSL
Published elevations from lake operators when provided by the data service.
Grant County, WA
Moderate Drought
StableModerate drought is affecting the watershed.
Severity
Official drought: 100% of watershed in official drought (D1+).
Aug 22, 2026
1,030.21 ft
-0.19 ft
Aug 21, 2026
1,030.4 ft
-0.06 ft
Aug 20, 2026
1,030.46 ft
-0.17 ft
Aug 19, 2026
1,030.63 ft
-0.18 ft
Aug 18, 2026
1,030.81 ft
-0.2 ft
Aug 17, 2026
1,031.01 ft
-0.22 ft
Aug 16, 2026
1,031.23 ft
-0.28 ft
| Date | Level (ft) | Change (ft) |
|---|---|---|
| Aug 22, 2026 | 1,030.21 | -0.19 |
| Aug 21, 2026 | 1,030.4 | -0.06 |
| Aug 20, 2026 | 1,030.46 | -0.17 |
| Aug 19, 2026 | 1,030.63 | -0.18 |
| Aug 18, 2026 | 1,030.81 | -0.2 |
| Aug 17, 2026 | 1,031.01 | -0.22 |
| Aug 16, 2026 | 1,031.23 | -0.28 |
| Aug 15, 2026 | 1,031.51 | -0.14 |
| Aug 14, 2026 | 1,031.65 | -0.09 |
| Aug 13, 2026 | 1,031.74 | -0.21 |
| Aug 12, 2026 | 1,031.95 | -0.25 |
| Aug 11, 2026 | 1,032.2 | -0.21 |
| Aug 10, 2026 | 1,032.41 | -0.26 |
| Aug 9, 2026 | 1,032.67 | -0.22 |
The current water level at Potholes Reservoir is 1,030.21 ft (updated 47 hours ago). You can track the Potholes Reservoir lake level on the interactive chart and daily history above.
Full pool for Potholes Reservoir is 1,047 ft — the normal conservation target elevation when the reservoir is at its designed summer or operating pool.
The current 7-day trend for the Potholes Reservoir lake level is falling — falling about 1.30 ft over the past week. See the history chart above for the full picture.
Based on the latest gauge reading, Potholes Reservoir is currently 16.79 ft below full pool.
Definitions for pool targets, datums, and how elevation readings are labeled.
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