Hj Mills Reclamation
Hj Mills Reclamation is an earth dam located in Riverside County, California, built in 1996. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Hj Mills Reclamation
The primary purpose of Hj Mills Reclamation 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 Metropolitan Water District Of Southern California (public utility). It impounds the Offstream.
The dam stands 48 feet tall and stretches 1,560 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 98 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1996, the structure is 30 years old.
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 12/09/2025.
At 48 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | California |
| County | Riverside |
| River/Stream | Offstream |
| Coordinates | 33.92310, -117.31500 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 48 ft |
| Dam Length | 1,560 ft |
| Year Completed | 1996 (30 years old) |
Storage & Hydraulics
| NID Storage | 98 acre-ft |
| Max Storage | 98 acre-ft |
| Surface Area | 16 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Metropolitan Water District Of Southern California |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 12/09/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01374 |
| Federal ID | CA01374 |
| More Info | State Dam Safety Program |