Whittier Reservoir No. 4
Whittier Reservoir No. 4 is an earth dam located in Los Angeles County, California, built in 1931. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Whittier Reservoir No. 4
The primary purpose of Whittier Reservoir No. 4 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 City Of Whittier Water District (local government). It impounds the Tr San Gabriel Riv.
The dam stands 55 feet tall and stretches 190 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 32 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1931, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 05/28/2025.
At 55 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | California |
| County | Los Angeles |
| River/Stream | Tr San Gabriel Riv |
| Coordinates | 33.99750, -118.04510 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Dam Length | 190 ft |
| Year Completed | 1931 (95 years old) |
Storage & Hydraulics
| NID Storage | 32 acre-ft |
| Max Storage | 32 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Whittier Water District |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/28/2025 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00153 |
| Federal ID | CA00153 |
| More Info | State Dam Safety Program |