Lakes / Washington / San Juan County
Lakes in San Juan County, Washington
5 lakes counted in San Juan County - the largest is Cascade Lake at 176 acres.
5
Lakes Counted
176 acres
Largest - Cascade Lake
San Juan County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Cascade Lake | San Juan | 176 acres | - |
| 2 | Horseshoe Lake | San Juan | 70 acres | - |
| 3 | Spencer Lake | San Juan | 67 acres | - |
| 4 | Hummel Lake | San Juan | 34 acres | - |
| 5 | Martin Lake | San Juan | 29 acres | - |
Sources: Washington DFW lake data; USGS. Verified October 30, 2026.