Diamond Valley Lake
Diamond Valley Lake is an earth dam located in Riverside County, California, built in 2000. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Diamond Valley Lake
The primary purpose of Diamond Valley Lake 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 Domenigoni Valley Cr near Menifee.
The dam stands 284 feet tall and stretches 8,300 feet across, creates a reservoir covering 4,860 acres, and has a maximum storage capacity of 800,000 acre-feet. Completed in 2000, the structure is 26 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. 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 02/04/2025.
At 284 feet, this dam is taller than 99% of all dams in the United States.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The California dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | California |
| County | Riverside |
| Nearest City | Menifee |
| River/Stream | Domenigoni Valley Cr |
| Coordinates | 33.68110, -117.06610 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 284 ft |
| Dam Height | 284 ft |
| Dam Length | 8,300 ft |
| Year Completed | 2000 (26 years old) |
Storage & Hydraulics
| NID Storage | 800,000 acre-ft |
| Max Storage | 800,000 acre-ft |
| Surface Area | 4,860 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Metropolitan Water District Of Southern California |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/04/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01410 |
| Federal ID | CA01410 |
| More Info | State Dam Safety Program |