Lakes / Missouri / Washington County
Lakes in Washington County, Missouri
9 lakes counted in Washington County - the largest is Sunnen Lake at 212.13 acres.
9
Lakes Counted
212.13 acres
Largest - Sunnen Lake
Washington County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Sunnen Lake | Washington | 212.13 acres | - |
| 2 | Palmer Lake | Washington | 103.06 acres | - |
| 3 | Hornsey Lake | Washington | 73.88 acres | - |
| 4 | Keyes Branch Mine Tailings Pond | Washington | 54.04 acres | - |
| 5 | Hornsey Brothers Lake | Washington | 48.93 acres | - |
| 6 | Apex Lake | Washington | 48.11 acres | - |
| 7 | Sayersbrook Lake | Washington | 44.8 acres | - |
| 8 | Parole Lake | Washington | 43.14 acres | - |
| 9 | Howell Lake | Washington | 27.96 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.