Of the 5 Washington lakes here with a published full pool, 5 sit below it. Another 12 have no full-pool figure and read against their own records instead. The newest reading on this page is from September 24, 2026.
| Lake | Level now | Full pool | Against full pool | Reading |
|---|---|---|---|---|
| Lake Chelan Chelan County PUD (FERC 637) | 1098.45 ft | 1100.00 ft | 1.5 ft below full pool — typical for late September | September 23, 2026 |
| Baker Lake Puget Sound Energy (Upper Baker Dam) | 720.97 ft | not published | Reading is typical for late September. | September 23, 2026 |
| Lake Merwin PacifiCorp (Merwin Dam) | 229.00 ft | not published | Reading is unusually low for late September. | September 23, 2026 |
| Lake Roosevelt USBR (Grand Coulee Dam) | 1284.70 ft | 1290.00 ft | 5.3 ft below full pool — typical for late September | September 24, 2026 |
| Lake Sammamish Natural lake; USGS gauge | 25.74 ft | not published | Reading is on the low side for late September. | September 23, 2026 |
| Lake Tapps Cascade Water Alliance | 540.18 ft | not published | Reading is unusually low for late September. | September 23, 2026 |
| Moses Lake Moses Lake Irrigation and Rehabilitation District | 1046.75 ft | not published | Reading is typical for late September. | September 23, 2026 |
| Swift Reservoir PacifiCorp (Swift Dam) | 967.00 ft | not published | Current reading shown; this gauge's public record is too short for seasonal comparisons. | September 23, 2026 |
| Banks Lake Bureau of Reclamation | 1568.73 ft | 1570.00 ft | 1.3 ft below full pool — typical for late July | July 21, 2026 |
| Lake Shannon Puget Sound Energy (Lower Baker Dam) | 409.79 ft | not published | Reading is typical for late September. | September 23, 2026 |
| Osoyoos Lake Natural lake; USGS gauge | 911.11 ft | not published | Reading is on the low side for late September. | September 23, 2026 |
| Potholes Reservoir Bureau of Reclamation | 1028.80 ft | 1046.50 ft | 17.7 ft below full pool — typical for late September | September 22, 2026 |
| Riffe Lake Tacoma Power | 738.69 ft | 778.00 ft | 39.3 ft below full pool — unusually low for mid-July | July 15, 2026 |
| Spada Lake Snohomish County PUD (Culmback Dam) | 1413.26 ft | not published | Reading is typical for late September. | September 23, 2026 |
| Spirit Lake Natural lake (Mount St. Helens); USGS gauge | 3441.60 ft | not published | Reading is typical for late August. | August 26, 2026 |
| Wynoochee Lake Tacoma Power (Wynoochee Dam) | 741.08 ft | not published | Reading is unusually low for late September. | September 23, 2026 |
| Yale Reservoir PacifiCorp (Yale Dam) | 473.00 ft | not published | Reading is unusually low for late September. | September 23, 2026 |
“Full pool” means the conservation pool — what that is, and what it is not. Lakes with no published figure are read against their own seasonal record instead.
Washington lake levels, asked and answered
What are the lake levels in Washington today?
Of the 5 Washington lakes here with a published full pool, 5 sit below it. Another 12 have no full-pool figure and read against their own records instead. The newest reading on this page is from September 24, 2026.
Which Washington lake is furthest below full pool?
Riffe Lake is the furthest down of the Washington lakes on this page, at 39.3 ft below its full pool.
Where do these Washington lake levels come from?
Each row is the gauge the agency that runs the lake publishes — the Corps of Engineers, the Bureau of Reclamation, the state water agency or the US Geological Survey, depending on the lake. Open a lake and its own page re-reads that gauge as the page loads, wherever the agency lets a browser do it.