Tribe No.1 Reservoir Report
Nearby: T. Trent No.1 Budahl
Last Updated: December 6, 2025
Tribe No.1, located in Ziebach, South Dakota, is a privately owned earth dam constructed in 1948 on the TR CHEYENNE river.
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Summary
With a height of 20 feet and a storage capacity of 150 acre-feet, this dam serves as a vital water resource for the surrounding area. Managed by the South Dakota Department of Environment and Natural Resources (DENR), Tribe No.1 is regulated, inspected, and enforced to ensure safety and compliance with state standards.
Although classified as a low hazard potential structure, the condition of Tribe No.1 is currently not rated, indicating a need for further assessment and evaluation. Despite the lack of a formal emergency action plan (EAP) and inundation maps, the dam meets state permitting and inspection requirements to safeguard against potential risks. With Dusty Johnson (R) as the Congressional representative overseeing the St. Paul District where Tribe No.1 is located, there is a level of federal oversight and accountability for the dam's operations.
As a key component of the water infrastructure in the region, Tribe No.1 plays a crucial role in water storage, flood control, and environmental management. With its historical significance dating back to the mid-20th century, ongoing maintenance and monitoring are essential to ensure the continued safety and functionality of this essential water resource in South Dakota.
Year Completed |
1948 |
Dam Length |
800 |
Dam Height |
20 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
150 |
Hazard Potential |
Low |
Nid Height |
20 |
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.1