Tribe No.11
Key Takeaway
Tribe No.11 is classified as low hazard in South Dakota. It was completed in 1960 and is 66 years old. Its primary use is water supply.
Physical Details
| Dam Height | 28 ft (taller than 77.7% in SD) |
| Dam Length | 500 ft |
| Dam Type | Earth |
| Max Storage | 170 acre-ft |
| Normal Storage | 72 acre-ft |
| Max Discharge | 1,680 cfs |
| Year Completed | 1960 (66 years old) |
| NID ID | SD02109 |
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
Nearby Dams
Matter
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Low Hazard 18 ftTribe No.3
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Low Hazard 18 ftK. Dorsey No.1
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Low Hazard 22 ftCarmichael
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Low Hazard 19 ftK. Dorsey No.2
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Low Hazard 22 ftM. Matthews
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Low Hazard 26 ftR. Bierman
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Low Hazard 17 ftFrequently Asked Questions
What is the hazard classification of Tribe No.11?
Tribe No.11 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.11?
Tribe No.11 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.11 built?
Tribe No.11 was completed in 1960, making it 66 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.11?
Tribe No.11 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.11?
Tribe No.11 has a dam height of 28 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.