Tribe No.7 is an earth dam located in Ziebach County, South Dakota, built in 1960. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 500 ft long, taller than 55% of U.S. dams with a recorded height. 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 Tribe No.7
The primary purpose of Tribe No.7 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 Cheyenne River Sioux Tribe (federal). It impounds the Tr Cheyenne.
The dam stands 26 feet tall and stretches 500 feet across, and has a maximum storage capacity of 187 acre-feet. Completed in 1960, the structure is well into its service life at over 50 years old.
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 | Ziebach |
| Nearest City | None |
| River/Stream | Tr Cheyenne |
| Coordinates | 44.72166, -101.92499 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 500 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 187 acre-ft |
| Max Storage | 187 acre-ft |
| Normal Storage | 116 acre-ft |
| Max Discharge | 3,000 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Cheyenne River Sioux Tribe |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00776 |
| Federal ID | SD00776 |
| More Info | State Dam Safety Program |