Bonesteel Lake
Bonesteel Lake is an earth dam located in Gregory County, South Dakota, built in 1935. It carries a Low hazard potential classification.
About Bonesteel Lake
The primary purpose of Bonesteel Lake 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 Ponca Creek-tr.
The dam stands 15 feet tall and stretches 550 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 132 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1935, 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 10/25/2023.
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Location
| State | South Dakota |
| County | Gregory |
| Nearest City | None |
| River/Stream | Ponca Creek-tr |
| Coordinates | 43.07166, -99.00166 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 550 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 132 acre-ft |
| Max Storage | 132 acre-ft |
| Normal Storage | 60 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,340 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&PL |
| Owner Type | State |
| Hazard Classification | Low |
| Last Inspection | 10/25/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00554 |
| Federal ID | SD00554 |
| More Info | State Dam Safety Program |