W. Mann No.1 Reservoir Report
Nearby: W. Mann No.2 W. Mann No.3
Last Updated: December 5, 2025
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Summary
Mann No.1 is a privately-owned dam located in Meade, South Dakota, along the TR CHEYENNE river. Built in 1948, this earth dam stands at a height of 17 feet and has a length of 540 feet, providing a storage capacity of 228 acre-feet. The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR), with state permitting, inspection, and enforcement in place.
Despite its low hazard potential and a condition assessment of "Not Rated," the dam's emergency action plan (EAP) status, risk assessment, and management measures remain undisclosed. The dam does not fall under the jurisdiction of the U.S. Army Corps of Engineers, with no associated federal funding, design, construction, or regulatory oversight. With its primary purpose unspecified, W. Mann No.1 stands as a testament to South Dakota's commitment to water resource management and climate resilience, safeguarding the local community from potential flooding events.
As water resource and climate enthusiasts, the data on W. Mann No.1 serves as a reminder of the critical role dams play in managing water resources and mitigating the impacts of extreme weather events. The dam's location along the TR CHEYENNE river highlights its importance in protecting the surrounding area from inundation and ensuring a reliable water supply. As we continue to face challenges posed by a changing climate, understanding the operational and safety aspects of dams like W. Mann No.1 is crucial for developing sustainable water management strategies and enhancing community resilience in the face of environmental threats.
Year Completed |
1948 |
Dam Length |
540 |
Dam Height |
17 |
River Or Stream |
TR CHEYENNE |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
228 |
Hazard Potential |
Low |
Nid Height |
17 |
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.1