Mcclellan Bros. Reservoir Report
Nearby: Pothast Dam Hickman No.1
Last Updated: December 7, 2025
Mcclellan Bros.
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Summary
is a privately-owned dam located in Ziebach, South Dakota, along the TR CHEYENNE river. Built in 1939, this Earth-type structure stands at a height of 25 feet and spans a length of 530 feet, with a storage capacity of 182 acre-feet. With a low hazard potential, this dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular state inspection, permitting, and enforcement.
Despite its age, Mcclellan Bros. has not been rated for its condition assessment, and emergency preparedness protocols, such as the existence of an Emergency Action Plan (EAP) or inundation maps, are not currently in place. The dam is not owned or funded by any federal agencies, and has not undergone modifications or improvements in recent years. With a maximum discharge capacity of 2745 cubic feet per second, it is important for stakeholders and local authorities to ensure proper monitoring and maintenance to mitigate any potential risks associated with this structure.
Overall, Mcclellan Bros. serves as a vital component of water resource management in South Dakota, providing storage and control along the TR CHEYENNE river. As climate change continues to impact water availability and quality, it is essential for dam owners and regulators to prioritize the safety and maintenance of these structures to protect downstream communities and ecosystems. Collaboration between state and local agencies, as well as proactive risk assessment and management measures, will be key in ensuring the long-term resilience of Mcclellan Bros. and other critical water infrastructure.
Year Completed |
1939 |
Dam Length |
530 |
Dam Height |
25 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
182 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Cheyenne R Near Plainview Sd
|
0cfs |
Moreau R Near Faith Sd
|
14cfs |
Grand R At Little Eagle Sd
|
47cfs |
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.
Mcclellan Bros.