Lake Wagner Dam
Lake Wagner Dam is an earth dam located in Charles Mix County, South Dakota, built in 1938. It carries a Significant hazard potential classification.
About Lake Wagner Dam
The primary purpose of Lake Wagner Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by S&pl (state). It impounds the Choteau Creek-tr near Wagner.
The dam stands 20 feet tall and stretches 465 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 215 acre-feet, and collects water from a drainage area of 16 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 10/03/2022.
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Location
| State | South Dakota |
| County | Charles Mix |
| Nearest City | Wagner |
| River/Stream | Choteau Creek-tr |
| Coordinates | 43.08525, -98.30433 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 465 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 215 acre-ft |
| Max Storage | 215 acre-ft |
| Normal Storage | 70 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 16 sq mi |
| Max Discharge | 5,333 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&PL |
| Owner Type | State |
| Hazard Classification | Significant |
| Last Inspection | 10/03/2022 |
| Emergency Action Plan | No |
Identifiers
| NID ID | SD00905 |
| Federal ID | SD00905 |
| More Info | State Dam Safety Program |