Sully Dam is an earth dam located in Tripp County, South Dakota, built in 1935. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 952 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 Sully Dam
The primary purpose of Sully 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 Tr-west Branch Bull Creek.
The dam stands 17 feet tall and stretches 952 feet across, and has a maximum storage capacity of 1,062 acre-feet. 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 12/21/2023.
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Location
| State | South Dakota |
| County | Tripp |
| Nearest City | None |
| River/Stream | Tr-west Branch Bull Creek |
| Coordinates | 43.37963, -99.58566 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 952 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 1,062 acre-ft |
| Max Storage | 1,062 acre-ft |
| Normal Storage | 420 acre-ft |
| Max Discharge | 1,599 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | S&pl |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 12/21/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00541 |
| Federal ID | SD00541 |
| More Info | State Dam Safety Program |