Lakes / California / Modoc County / Mapes Reservoir
Mapes Reservoir, California
26 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
41.60 degrees N, 120.76 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 Mapes Reservoir Stacks Up
- Larger than 3% of the 1,147 lakes counted in California.
- About 212 miles from Sacramento, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Antelope Reservoir | Modoc | 1.9 mi | 215 acres |
| Antelope Plains | Modoc | 2.3 mi | 1,985 acres |
| Antelope Plains | Modoc | 3.0 mi | 53 acres |
| Jacks Butte Tank | Modoc | 4.0 mi | 89 acres |
| Reservoir C | Modoc | 4.2 mi | 185 acres |
| Dobe Swale | Modoc | 5.6 mi | 286 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Mapes Reservoir
How Big Is Mapes Reservoir?
Mapes Reservoir covers 26 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 84810088). Verified October 30, 2026.