Wrigley Reservoir
Wrigley Reservoir is an earth dam located in Los Angeles County, California, built in 1930. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Wrigley Reservoir
The primary purpose of Wrigley Reservoir is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Southern California Edison (private). It impounds the Haypress Creek.
The dam stands 42 feet tall and stretches 190 feet across, creates a reservoir covering 2 acres, and has a maximum storage capacity of 62 acre-feet. Completed in 1930, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 12/04/2024.
At 42 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | California |
| County | Los Angeles |
| River/Stream | Haypress Creek |
| Coordinates | 33.35330, -118.35170 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 190 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 62 acre-ft |
| Max Storage | 62 acre-ft |
| Surface Area | 2 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Southern California Edison |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/04/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00444 |
| Federal ID | CA00444 |
| More Info | State Dam Safety Program |