Pierpont is an earth dam located in Day County, South Dakota, built in 1937. It carries a Low hazard potential classification.
Dam profile
NID height · 24 ft24 ft tall and 560 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 Pierpont
The primary purpose of Pierpont 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 S&pl (state). It impounds the MUD Creek.
The dam stands 24 feet tall and stretches 560 feet across, creates a reservoir covering 71 acres, has a maximum storage capacity of 1,200 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1937, the structure is well-established, with more than 75 years of service.
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. The most recent inspection on record was 11/22/2022.
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Location
| State | South Dakota |
| County | Day |
| Nearest City | None |
| River/Stream | MUD Creek |
| Coordinates | 45.45930, -97.83680 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 24 ft |
| Dam Height | 24 ft |
| Dam Length | 560 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 1,200 acre-ft |
| Max Storage | 1,200 acre-ft |
| Normal Storage | 600 acre-ft |
| Surface Area | 71 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 3,300 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/22/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00012 |
| Federal ID | SD00012 |
| More Info | State Dam Safety Program |