Wilmarth
Wilmarth is an earth dam located in Aurora County, South Dakota, built in 1937. It carries a Low hazard potential classification.
About Wilmarth
The primary purpose of Wilmarth is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Gf&p (state). It impounds the W Firesteel Creek.
The dam stands 31 feet tall and stretches 940 feet across, creates a reservoir covering 110 acres, has a maximum storage capacity of 2,510 acre-feet, and collects water from a drainage area of 56 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 11/02/2022.
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Location
| State | South Dakota |
| County | Aurora |
| Nearest City | None |
| River/Stream | W Firesteel Creek |
| Coordinates | 43.86261, -98.57202 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 940 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 2,510 acre-ft |
| Max Storage | 2,510 acre-ft |
| Normal Storage | 1,155 acre-ft |
| Surface Area | 110 acres |
| Drainage Area | 56 sq mi |
| Max Discharge | 5,091 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | GF&P |
| Owner Type | State |
| Hazard Classification | Low |
| Last Inspection | 11/02/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00002 |
| Federal ID | SD00002 |
| More Info | State Dam Safety Program |