Black Mountain Water Tank
Black Mountain Water Tank is an other dam located in San Diego County, California, built in 2002. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Black Mountain Water Tank
The primary purpose of Black Mountain Water Tank 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 San Diego (local government). It impounds the Offstream near Rancho Penasquitos.
The dam stands 55 feet tall, creates a reservoir covering 4 acres, and has a maximum storage capacity of 77 acre-feet. Completed in 2002, the structure is relatively new.
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 07/24/2024.
At 55 feet, this dam is taller than 94% 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 | Rancho Penasquitos |
| River/Stream | Offstream |
| Coordinates | 32.98520, -117.12730 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Year Completed | 2002 (24 years old) |
Storage & Hydraulics
| NID Storage | 77 acre-ft |
| Max Storage | 77 acre-ft |
| Surface Area | 4 acres |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of San Diego |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/24/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CA01442 |
| Federal ID | CA01442 |
| More Info | State Dam Safety Program |