Blossom Valley Reservoir
Blossom Valley Reservoir is an earth dam located in San Diego County, California, built in 1962. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Blossom Valley Reservoir
The primary purpose of Blossom Valley 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 Padre Dam Municipal Water District (public utility). It impounds the Offstream near Blossom Valley.
The dam stands 42 feet tall and stretches 350 feet across, creates a reservoir covering 1 acres, and has a maximum storage capacity of 22 acre-feet. Completed in 1962, the structure is well into its service life at over 50 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 02/27/2025.
At 42 feet, this dam is taller than 89% of dams nationwide.
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 Diego |
| Nearest City | Blossom Valley |
| River/Stream | Offstream |
| Coordinates | 32.86570, -116.85790 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 350 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 22 acre-ft |
| Max Storage | 22 acre-ft |
| Surface Area | 1 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Padre Dam Municipal Water District |
| Owner Type | Public Utility |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 02/27/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA00892 |
| Federal ID | CA00892 |
| More Info | State Dam Safety Program |