Standing Rock Tribe is an earth dam located in Corson County, South Dakota, built in 1939. It carries a Significant hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 445 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 Standing Rock Tribe
The primary purpose of Standing Rock Tribe 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 Standing Rock Tribe (federal). It impounds the Tr-oak Creek near Wakpala.
The dam stands 21 feet tall and stretches 445 feet across, and has a maximum storage capacity of 118 acre-feet. Completed in 1939, 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.
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Location
| State | South Dakota |
| County | Corson |
| Nearest City | Wakpala |
| River/Stream | Tr-oak Creek |
| Coordinates | 45.72999, -100.65166 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 445 ft |
| Year Completed | 1939 (87 years old) |
Storage & Hydraulics
| NID Storage | 118 acre-ft |
| Max Storage | 118 acre-ft |
| Normal Storage | 65 acre-ft |
| Max Discharge | 2,940 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Standing Rock Tribe |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00723 |
| Federal ID | SD00723 |
| More Info | State Dam Safety Program |