Lakes / California / Alameda County / Bethany Reservoir
Bethany Reservoir, California
164 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
37.78 degrees N, 121.61 degrees W - Alameda County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Bethany Reservoir Stacks Up
- Larger than 65% of the 1,147 lakes counted in California.
- About 44 miles from San Francisco, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Clifton Court Forebay | Contra Costa | 4.6 mi | 2,215 acres |
| Willow Lake | Contra Costa | 9.0 mi | 89 acres |
| Marsh Creek Reservoir | Contra Costa | 9.9 mi | 51 acres |
| Lake del Valle | Alameda | 14 mi | 703 acres |
| Antioch Municipal Reservoir | Contra Costa | 17 mi | 57 acres |
| Oakwood Lake | San Joaquin | 17 mi | 108 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Bethany Reservoir
How Big Is Bethany Reservoir?
Bethany Reservoir covers 164 acres in Alameda County, California.
What Is the Largest Lake in Alameda County?
San Antonio Reservoir is the largest lake in Alameda County, at 770 acres.
Largest Lakes in California
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Salton Sea | Imperial | 233,096 acres | - |
| 2 | Lake Tahoe | Placer | 122,975 acres | - |
| 3 | Goose Lake | Modoc | 93,048 acres | - |
| 4 | Honey Lake | Lassen | 59,917 acres | - |
| 5 | Mono Lake | Mono | 45,124 acres | - |
All 1,147 California lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 153039122). Verified October 30, 2026.