Richmond Hill is an earth dam located in Lawrence County, South Dakota, built in 1988. It carries a Low hazard potential classification.
Dam profile
NID height · 79 ft79 ft tall and 400 ft long, taller than 97% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Richmond Hill
The primary purpose of Richmond Hill 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 Lac Minerals LLC (private). It impounds the Spearfish Creek-tr.
The dam stands 79 feet tall and stretches 400 feet across, and has a maximum storage capacity of 241 acre-feet. Completed in 1988, the structure is 38 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 79 feet, this dam is taller than 97% of all dams in the United States.
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Location
| State | South Dakota |
| County | Lawrence |
| Nearest City | None |
| River/Stream | Spearfish Creek-tr |
| Coordinates | 44.40136, -103.84820 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 79 ft |
| Dam Height | 79 ft |
| Dam Length | 400 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 241 acre-ft |
| Max Storage | 241 acre-ft |
| Spillway Type | None |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Lac Minerals LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD02624 |
| Federal ID | SD02624 |
| More Info | State Dam Safety Program |