Lakes / California / Alpine County / Union Reservoir
Union Reservoir, California
193 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
38.43 degrees N, 119.99 degrees W - Alpine 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 Reservoir Stacks Up
- Larger than 68% of the 1,147 lakes counted in California.
- About 82 miles from Sacramento, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Utica Reservoir | Alpine | 0.7 mi | 210 acres |
| Spicer Meadow Reservoir | Alpine | 2.4 mi | 1,407 acres |
| Lake Alpine | Alpine | 3.0 mi | 176 acres |
| Donnell Lake | Tuolumne | 7.1 mi | 421 acres |
| Highland Lakes | Alpine | 11 mi | 35 acres |
| Salt Springs Reservoir | Amador | 11 mi | 918 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Union Reservoir
How Big Is Union Reservoir?
Union Reservoir covers 193 acres in Alpine County, California.
What Is the Largest Lake in Alpine County?
Spicer Meadow Reservoir is the largest lake in Alpine County, at 1,407 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 59568537). Verified October 30, 2026.