Lakes / California / Lassen County / McCoy Flat Reservoir
McCoy Flat Reservoir, California
1,408 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
40.47 degrees N, 120.95 degrees W - Lassen 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 McCoy Flat Reservoir Stacks Up
- Larger than 91% of the 1,147 lakes counted in California.
- About 134 miles from Sacramento, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Mud Lake | Lassen | 3.6 mi | 38 acres |
| Hog Flat Reservoir | Lassen | 3.9 mi | 693 acres |
| Long Lake | Lassen | 4.6 mi | 85 acres |
| Feather Lake | Lassen | 5.5 mi | 55 acres |
| Silver Lake | Lassen | 11 mi | 98 acres |
| Echo Lake | Plumas | 11 mi | 30 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About McCoy Flat Reservoir
How Big Is McCoy Flat Reservoir?
McCoy Flat Reservoir covers 1,408 acres in Lassen County, California.
What Is the Largest Lake in Lassen County?
Honey Lake is the largest lake in Lassen County, at 59,917 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 55105233). Verified October 30, 2026.