Streeter Dam Reservoir Report

Last Updated: December 5, 2025

Streeter Dam, located in Custer, South Dakota, is a privately owned structure built in 1945 for water resource management.


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Summary

The dam stands at 22 feet high and has a storage capacity of 70 acre-feet, with a normal storage level of 55 acre-feet. It spans a length of 280 feet and is classified as an earth dam, serving as a critical component in regulating a tributary of the Cheyenne River.

Managed by the South Dakota Department of Environment and Natural Resources (DENR), Streeter Dam is subject to state regulations for permitting, inspection, and enforcement. With a significant hazard potential, the dam's condition assessment is currently listed as "Not Rated," highlighting the importance of continued monitoring and maintenance to ensure its structural integrity and public safety. While the dam has not been modified in recent years and lacks certain emergency preparedness measures, such as an Emergency Action Plan (EAP) and inundation maps, its presence underscores the importance of sustainable water resource management in the region.

Despite its age, Streeter Dam remains a vital infrastructure for water storage and regulation in the area, playing a crucial role in flood control and irrigation. As climate change impacts continue to affect water resources, the dam's significance in mitigating potential risks and ensuring water security for the surrounding community becomes increasingly apparent. With the involvement of state regulators and local representatives, efforts to assess and address the dam's condition and emergency preparedness measures will be essential to its continued functionality and resilience in the face of changing environmental conditions.

Year Completed

1945

Dam Length

280

Dam Height

22

River Or Stream

TRIBUTARY OF CHEYENNE RIVER

Primary Dam Type

Earth

Hydraulic Height

22

Nid Storage

70

Hazard Potential

Significant

Nid Height

22
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.