Lakes / California / Modoc County / South Mountain Reservoir
South Mountain Reservoir, California
186 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
41.81 degrees N, 120.65 degrees W - Modoc 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 South Mountain Reservoir Stacks Up
- Larger than 68% of the 1,147 lakes counted in California.
- About 227 miles from Sacramento, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Telephone Flat Reservoir | Modoc | 2.6 mi | 448 acres |
| Rimrock Valley Reservoir | Modoc | 2.8 mi | 56 acres |
| Green Tank Reservoir | Modoc | 2.8 mi | 149 acres |
| Deer Hill Reservoir | Modoc | 3.0 mi | 109 acres |
| Mud Lake | Modoc | 3.1 mi | 35 acres |
| Cow Head Tank | Modoc | 3.2 mi | 337 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About South Mountain Reservoir
How Big Is South Mountain Reservoir?
South Mountain Reservoir covers 186 acres in Modoc County, California.
What Is the Largest Lake in Modoc County?
Goose Lake is the largest lake in Modoc County, at 93,048 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 84071943). Verified October 30, 2026.