Piotter Dam Reservoir Report
Nearby: Lewandowski Dam Brown's Valley Dam
Last Updated: December 13, 2025
Piotter Dam, located in Roberts, South Dakota, is a privately owned structure that plays a crucial role in managing water resources in the area.
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Summary
Constructed in 2009 by KONECHNE ENG., this earth dam stands at a height of 17 feet and stretches 400 feet in length. It has a storage capacity of 175 acre-feet, with a normal storage level of 84 acre-feet, serving the TR MINNESOTA - WHETSTONE river/stream.
Despite its low hazard potential and moderate risk assessment rating, Piotter Dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR). It is subject to state jurisdiction, permitting, inspection, and enforcement, ensuring that the structure is maintained and operated safely. The dam features an uncontrolled spillway with a width of 60 feet, capable of handling a maximum discharge of 1250 cubic feet per second.
Overall, Piotter Dam serves as a vital component of the local water management infrastructure, providing essential flood control and water storage capabilities. With its strategic location and design features, it exemplifies the importance of proper dam construction and regulation in safeguarding water resources and mitigating potential risks associated with climate variability.
Year Completed |
2009 |
Dam Length |
400 |
Dam Height |
17 |
River Or Stream |
TR MINNESOTA - WHETSTONE |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Drainage Area |
10 |
Nid Storage |
175 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Piotter Dam