Tribe No.9
Key Takeaway
Tribe No.9 is classified as low hazard in South Dakota. It was completed in 1959 and is 67 years old. Its primary use is water supply.
Physical Details
| Dam Height | 21 ft (taller than 40.7% in SD) |
| Dam Length | 525 ft |
| Dam Type | Earth |
| Max Storage | 132 acre-ft |
| Normal Storage | 77 acre-ft |
| Max Discharge | 2,700 cfs |
| Year Completed | 1959 (67 years old) |
| NID ID | SD00765 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
CHEYENNE RIVER SIOUX TRIBE
Federal Government
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Low Hazard 18 ftR. Fields No.2
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Low Hazard 18 ftR. Fields No.1
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Low Hazard 14 ftFrequently Asked Questions
What is the hazard classification of Tribe No.9?
Tribe No.9 is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Tribe No.9?
Tribe No.9 is owned by CHEYENNE RIVER SIOUX TRIBE (Federal Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Tribe No.9 built?
Tribe No.9 was completed in 1959, making it 67 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Tribe No.9?
Tribe No.9 serves the following purposes: Water Supply. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Tribe No.9?
Tribe No.9 has a dam height of 21 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.