Lakes / California / Los Angeles County / Castaic Lake
Castaic Lake, California
2,008 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - California
34.54 degrees N, 118.60 degrees W - Los Angeles 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 Castaic Lake Stacks Up
- Larger than 94% of the 1,147 lakes counted in California.
- The largest lake in Los Angeles County among those counted.
- About 39 miles from Los Angeles, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Castaic Lagoon | Los Angeles | 2.3 mi | 165 acres |
| Elderberry Forebay | Los Angeles | 3.1 mi | 388 acres |
| Dry Canyon Reservoir | Los Angeles | 5.5 mi | 46 acres |
| Lake Piru | Ventura | 9.4 mi | 1,066 acres |
| Pyramid Lake | Los Angeles | 13 mi | 1,177 acres |
| Bouquet Reservoir | Los Angeles | 13 mi | 590 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Castaic Lake
How Big Is Castaic Lake?
Castaic Lake covers 2,008 acres in Los Angeles County, California.
What Is the Largest Lake in Los Angeles County?
Castaic Lake is the largest lake in Los Angeles County, at 2,008 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 120025139). Verified October 30, 2026.