Seven Oaks
Seven Oaks is a rockfill dam located in San Bernardino County, California, built in 1999. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Seven Oaks
The primary purpose of Seven Oaks is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by County Of San Bernardino Department Of Public Works (local government). It impounds the Santa Ana Riv near San Bernardino.
The dam stands 550 feet tall and stretches 2,980 feet across, creates a reservoir covering 780 acres, has a maximum storage capacity of 145,600 acre-feet, and collects water from a drainage area of 177 square miles. Completed in 1999, the structure is 27 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 08/26/2024.
At 550 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 | San Bernardino |
| Nearest City | San Bernardino |
| River/Stream | Santa Ana Riv |
| Coordinates | 34.11730, -117.10190 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 550 ft |
| Dam Height | 550 ft |
| Dam Length | 2,980 ft |
| Year Completed | 1999 (27 years old) |
Storage & Hydraulics
| NID Storage | 145,600 acre-ft |
| Max Storage | 145,600 acre-ft |
| Surface Area | 780 acres |
| Drainage Area | 177 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | County of San Bernardino Department of Public Works |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/26/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01530 |
| Federal ID | CA01530 |
| More Info | State Dam Safety Program |