Tribe No.6 Reservoir Report
Nearby: Tribe No.7 B. Helleckson
Last Updated: December 6, 2025
Tribe No.6, located in Ziebach, South Dakota, serves as a vital water supply structure managed by the Tribal Government.
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Summary
This earth dam, standing at 21 feet high and spanning 800 feet in length, was completed in 1947 and has a storage capacity of 242 acre-feet. Positioned along the TR CHEYENNE river, Tribe No.6 plays a crucial role in providing water resources for the surrounding area, with a maximum discharge capacity of 1050 cubic feet per second.
Despite its low hazard potential, Tribe No.6 has not been rated for its condition assessment, indicating a need for further evaluation and maintenance. The dam's emergency action plan, inspection frequency, and risk management measures are currently not updated or assessed. While it continues to support water supply purposes, there is a lack of information on its overall operational and safety protocols, suggesting a need for increased oversight and management to ensure its continued functionality and safety for the community.
Year Completed |
1947 |
Dam Length |
800 |
Dam Height |
21 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
21 |
Nid Storage |
242 |
Structural Height |
21 |
Hazard Potential |
Low |
Nid Height |
21 |
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.6