Summary
Built in 1970, this earth dam stands at 27 feet high and spans 375 feet in length, with a storage capacity of 44 acre-feet. The dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular inspections and enforcement measures to ensure its safety and compliance with state regulations.
Despite its low hazard potential, Evenson has been assessed with a moderate risk rating of 3, indicating some level of potential risk that should be managed. While the dam's condition has not been rated, it is reassuring to note that it meets state permitting and inspection requirements. The dam's spillway is uncontrolled, with a maximum discharge capacity of 579 cubic feet per second, adding to its functionality as a flood control structure within the St. Paul District.
For water resource and climate enthusiasts, Evenson provides a fascinating case study of a privately owned dam in South Dakota that plays a crucial role in managing water flow along the TR-BIG SIOUX river. With its moderate risk rating and low hazard potential, the dam serves as an important piece of infrastructure in the region, demonstrating the need for ongoing monitoring and management to ensure its continued safety and effectiveness in water resource management.
Year Completed |
1970 |
Dam Length |
375 |
Dam Height |
27 |
River Or Stream |
TR-BIG SIOUX |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
44 |
Hazard Potential |
Low |
Nid Height |
27 |
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.
Evenson