Black Reservoir is an earth dam located in Mono County, California, built in 1905. It carries a Low hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 18 ft18 ft tall and 1,330 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Black Reservoir
The primary purpose of Black 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 The Wildlands Conservancy (private). It impounds the Black Creek.
The dam stands 18 feet tall and stretches 1,330 feet across, creates a reservoir covering 21 acres, has a maximum storage capacity of 185 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1905, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/24/2024.
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Location
| State | California |
| County | Mono |
| River/Stream | Black Creek |
| Coordinates | 38.33740, -119.47630 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 1,330 ft |
| Year Completed | 1905 (121 years old) |
Storage & Hydraulics
| NID Storage | 185 acre-ft |
| Max Storage | 185 acre-ft |
| Surface Area | 21 acres |
| Drainage Area | 0 sq mi |
Ownership & Safety
| Purpose | Water Supply |
| Owner | The Wildlands Conservancy |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/24/2024 |
| Emergency Action Plan | No |
Identifiers
| NID ID | CA00646 |
| Federal ID | CA00646 |
| More Info | State Dam Safety Program |