Black Watershed Structure Y-36-21 Dam is an earth dam located in Holmes County, Mississippi, built in 1963. It carries a Low hazard potential classification.
Dam profile
NID height · 38 ft38 ft tall, taller than 84% of U.S. dams with a recorded height. 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 Watershed Structure Y-36-21 Dam
The primary purpose of Black Watershed Structure Y-36-21 Dam 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 local government-owned.
The dam stands 38 feet tall, has a maximum storage capacity of 1,144 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1963, the structure is well into its service life at over 50 years 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.
At 38 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | Mississippi |
| County | Holmes |
| Coordinates | 33.20060, -90.04064 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 1,144 acre-ft |
| Max Storage | 1,144 acre-ft |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MS00079 |
| Federal ID | MS00079 |
| More Info | State Dam Safety Program |