Lakes / California / San Luis Obispo County / Oso Flaco Lake
Oso Flaco Lake, California
40 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
35.03 degrees N, 120.62 degrees W - San Luis Obispo 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 Oso Flaco Lake Stacks Up
- Larger than 23% of the 1,147 lakes counted in California.
- About 127 miles from Fresno, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| White Lake | San Luis Obispo | 2.6 mi | 45 acres |
| Guadalupe Lake | Santa Barbara | 10 mi | 25 acres |
| Lopez Reservoir | San Luis Obispo | 11 mi | 29 acres |
| Lopez Lake | San Luis Obispo | 14 mi | 586 acres |
| Laguna Lake | San Luis Obispo | 17 mi | 100 acres |
| Twitchell Reservoir | Santa Barbara | 17 mi | 156 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Oso Flaco Lake
How Big Is Oso Flaco Lake?
Oso Flaco Lake covers 40 acres in San Luis Obispo County, California.
What Is the Largest Lake in San Luis Obispo County?
Lake Nacimiento is the largest lake in San Luis Obispo County, at 2,985 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 120025102). Verified October 30, 2026.