Tribe No.7 Reservoir Report
Nearby: Tribe No.6 Tribe No.8
Last Updated: December 6, 2025
Tribe No.7, located in Ziebach, South Dakota, is a crucial water supply dam completed in 1960.
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Summary
Owned by the Tribal Government, it stands at a height of 26 feet and has a storage capacity of 187 acre-feet. With its primary purpose being water supply, Tribe No.7 plays a vital role in providing essential water resources to the surrounding community. Situated on the TR CHEYENNE river, this earth dam is regulated by the state of South Dakota and has a low hazard potential.
Despite its importance in water supply management, Tribe No.7 has not been rated for its condition assessment. The dam spans 500 feet in length and can discharge up to 3000 cubic feet of water per second. As a federally owned structure, it is not under the jurisdiction of the U.S. Army Corps of Engineers and lacks updated emergency action plans and risk assessment measures. While it currently poses a low hazard potential, ongoing assessments and management measures are essential for ensuring the safety and sustainability of this critical water resource infrastructure in South Dakota.
Year Completed |
1960 |
Dam Length |
500 |
Dam Height |
26 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
26 |
Nid Storage |
187 |
Structural Height |
26 |
Hazard Potential |
Low |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Tribe No.7