Lakes / California / El Dorado County / Union Valley Reservoir
Union Valley Reservoir, California
2,735 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
38.87 degrees N, 120.41 degrees W - El Dorado 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 Union Valley Reservoir Stacks Up
- Larger than 95% of the 1,147 lakes counted in California.
- About 62 miles from Sacramento, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Junction Reservoir | El Dorado | 2.7 mi | 62 acres |
| Ice House Reservoir | El Dorado | 4.8 mi | 648 acres |
| Gerle Creek Divide Reservoir | El Dorado | 6.7 mi | 45 acres |
| Wrights Lake | El Dorado | 9.5 mi | 64 acres |
| Loon Lake | El Dorado | 10 mi | 992 acres |
| Stumpy Meadows Reservoir | El Dorado | 10 mi | 343 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Union Valley Reservoir
How Big Is Union Valley Reservoir?
Union Valley Reservoir covers 2,735 acres in El Dorado County, California.
What Is the Largest Lake in El Dorado County?
Folsom Lake is the largest lake in El Dorado County, at 4,109 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 63434896). Verified October 30, 2026.