Tribe No.8
Tribe No.8 is an earth dam located in Ziebach County, South Dakota, built in 1959. It carries a Low hazard potential classification.
About Tribe No.8
The primary purpose of Tribe No.8 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 23 feet tall and stretches 500 feet across, and has a maximum storage capacity of 230 acre-feet. Completed in 1959, 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 | 44.70333, -101.85666 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 500 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 230 acre-ft |
| Max Storage | 230 acre-ft |
| Normal Storage | 163 acre-ft |
| Max Discharge | 2,100 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CHEYENNE RIVER SIOUX TRIBE |
| Owner Type | Federal |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | SD00777 |
| Federal ID | SD00777 |
| More Info | State Dam Safety Program |