| Elderberry Forebay Dam | |
| Dam Crosses: | Castaic Creek |
| Location: | Los Angeles County, California |
| Dam Type: | Earthfill[1] |
| Dam Length: | 1935feet |
| Dam Height: | 179feet |
| Dam Width Base: | 25feet |
| Dam Volume: | 5896950cuyd |
| Dam Elevation Crest: | 1550feet |
| Res Name: | Elderberry Forebay |
| Res Capacity Total: | 28400acre feet |
| Res Catchment: | 81.6sqmi |
| Res Surface: | 450acres |
| Res Elevation: | 1519feet |
| Coordinates: | 34.5619°N -118.6308°W |
Elderberry Forebay Dam is a dam located in the Sierra Pelona Mountains of northwestern Los Angeles County, California.The dam partitions Elderberry Forebay from Castaic Lake. It forms the headwater reservoir for Castaic Power Plant, a pumped-storage hydroelectricity generation facility.[1] [2] The dam was completed in 1974 as part of the California State Water Project.