Lakes / California / Contra Costa County
Lakes in Contra Costa County, California
10 lakes counted in Contra Costa County - the largest is Clifton Court Forebay at 2,215 acres.
10
Lakes Counted
2,215 acres
Largest - Clifton Court Forebay
Contra Costa County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Clifton Court Forebay | Contra Costa | 2,215 acres | - |
| 2 | Sherman Lake | Contra Costa | 1,841 acres | - |
| 3 | San Pablo Reservoir | Contra Costa | 785 acres | - |
| 4 | Briones Reservoir | Contra Costa | 669 acres | - |
| 5 | Mallard Reservoir | Contra Costa | 203 acres | - |
| 6 | Lafayette Reservoir | Contra Costa | 105 acres | - |
| 7 | Willow Lake | Contra Costa | 89 acres | - |
| 8 | Contra Loma Reservoir | Contra Costa | 69 acres | - |
| 9 | Antioch Municipal Reservoir | Contra Costa | 57 acres | - |
| 10 | Marsh Creek Reservoir | Contra Costa | 51 acres | - |
Sources: USGS National Hydrography Dataset lake data; USGS. Verified October 30, 2026.