Nagel Bros. Reservoir Report
Nearby: Bartels Dam Joe Mangin
Last Updated: December 13, 2025
Nagel Bros.
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Summary
is a privately owned dam located in Potter, South Dakota, along the TR-CHEYENNE CREEK. Built in 1945, this earth dam stands at a height of 16 feet and stretches over 405 feet in length. With a storage capacity of 77 acre-feet, it serves as a low hazard structure with a condition assessment currently marked as "Not Rated."
Managed by the South Dakota Department of Environment and Natural Resources (DENR), Nagel Bros. is regulated, permitted, inspected, and enforced by the state. Situated within the St. Paul District of the US Army Corps of Engineers, it operates under the oversight of Dusty Johnson (R), the Congressional Representative for the area. Although the dam has not been modified in recent years, it continues to provide essential water resource management for the region, showcasing a commitment to safety and compliance in its operations.
Year Completed |
1945 |
Dam Length |
405 |
Dam Height |
16 |
River Or Stream |
TR-CHEYENNE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
77 |
Hazard Potential |
Low |
Nid Height |
16 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Grand R At Little Eagle Sd
|
47cfs |
Bad R Near Fort Pierre Sd
|
7cfs |
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.
Nagel Bros.