W. Mann No.2 Reservoir Report
Nearby: W. Mann No.1 W. Mann No.3
Last Updated: December 5, 2025
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Summary
Mann No.2 is a private earth dam located in Meade, South Dakota, along the TR CHEYENNE river. Constructed in 1947, this dam stands at 16 feet high and has a storage capacity of 84 acre-feet, making it a crucial water resource structure in the region. With a maximum discharge of 1000 cfs, the dam serves multiple purposes, including flood control and water storage for agricultural and municipal use.
Managed by the South Dakota Department of Environment and Natural Resources (DENR), W. Mann No.2 is regulated, permitted, inspected, and enforced by the state agency to ensure its safety and functionality. Despite being categorized as low hazard potential and not rated for condition assessment, the dam plays a vital role in water resource management in the area. With Dusty Johnson (R) as the Congressional Representative for the district, the dam's operational and emergency response protocols are closely monitored to prevent any potential risks or failures.
While lacking specific details on emergency action plans and risk management measures, W. Mann No.2 remains an essential infrastructure for water supply and climate resilience in Meade County. As water resource and climate enthusiasts, it is crucial to stay informed about the condition and regulatory oversight of such dams to ensure their continued effectiveness in mitigating flooding and supporting the local ecosystem.
Year Completed |
1947 |
Dam Length |
530 |
Dam Height |
16 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
84 |
Hazard Potential |
Low |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Belle Fourche River Near Elm Springs
|
17900cfs |
Cheyenne R Near Plainview Sd
|
0cfs |
Elk Cr Near Elm Springs Sd
|
0cfs |
Belle Fourche R Near Sturgis Sd
|
34cfs |
Moreau R Near Faith Sd
|
14cfs |
Cheyenne River Near Wasta
|
190cfs |
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.
W. Mann No.2