Lakes / California / Orange County / San Joaquin Reservoir
San Joaquin Reservoir, California
53 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
33.62 degrees N, 117.84 degrees W - Orange 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 San Joaquin Reservoir Stacks Up
- Larger than 34% of the 1,147 lakes counted in California.
- About 38 miles from Los Angeles, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Sand Canyon Reservoir | Orange | 3.3 mi | 35 acres |
| North Lake | Orange | 5.2 mi | 32 acres |
| Sulphur Creek Reservoir | Orange | 9.3 mi | 32 acres |
| El Toro Reservoir | Orange | 10 mi | 25 acres |
| Irvine Lake | Orange | 13 mi | 396 acres |
| Walnut Canyon Reservoir | Orange | 16 mi | 41 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About San Joaquin Reservoir
How Big Is San Joaquin Reservoir?
San Joaquin Reservoir covers 53 acres in Orange County, California.
What Is the Largest Lake in Orange County?
Irvine Lake is the largest lake in Orange County, at 396 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 126859585). Verified October 30, 2026.