Lakes / California / Siskiyou County / Barnum Flat Reservoir
Barnum Flat Reservoir, California
391 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
41.32 degrees N, 121.47 degrees W - Siskiyou 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 Barnum Flat Reservoir Stacks Up
- Larger than 79% of the 1,147 lakes counted in California.
- About 189 miles from Sacramento, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Mosquito Lake | Modoc | 2.0 mi | 108 acres |
| Whitehorse Flat Reservoir | Modoc | 2.7 mi | 1,465 acres |
| Whitehorse Flat Reservoir | Modoc | 4.5 mi | 469 acres |
| Little Egg Lake | Modoc | 12 mi | 61 acres |
| White Deer Lake | Siskiyou | 14 mi | 40 acres |
| Horr Pond | Shasta | 15 mi | 1,765 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Barnum Flat Reservoir
How Big Is Barnum Flat Reservoir?
Barnum Flat Reservoir covers 391 acres in Siskiyou County, California.
What Is the Largest Lake in Siskiyou County?
Tule Lake is the largest lake in Siskiyou County, at 7,403 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 83408400). Verified October 30, 2026.