Hamill Dam is an earth dam located in Tripp County, South Dakota, built in 1933. It carries a Low hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 752 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 Hamill Dam
The primary purpose of Hamill Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Rosebud Sioux Tribe (federal). It impounds the Trib. White River.
The dam stands 21 feet tall and stretches 752 feet across, and has a maximum storage capacity of 580 acre-feet. Completed in 1933, 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.
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Location
| State | South Dakota |
| County | Tripp |
| Nearest City | None |
| River/Stream | Trib. White River |
| Coordinates | 43.59833, -99.67832 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 752 ft |
| Year Completed | 1933 (93 years old) |
Storage & Hydraulics
| NID Storage | 580 acre-ft |
| Max Storage | 580 acre-ft |
| Normal Storage | 380 acre-ft |
| Max Discharge | 2,400 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Rosebud Sioux Tribe |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00537 |
| Federal ID | SD00537 |
| More Info | State Dam Safety Program |