Simons Bros. Reservoir Report
Nearby: Roy Brown Wm T Malloy
Last Updated: December 6, 2025
Simons Bros., a private dam located in Perkins, South Dakota, is regulated by the state's Department of Environment and Natural Resources (DENR).
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Summary
Built in 1952, this earth dam stands at a height of 17 feet and spans a length of 520 feet, with a capacity to store 65 acre-feet of water from the TR-GRAND RIVER. The dam's primary purpose and associated structures are unspecified, but it is considered to have low hazard potential with a current condition assessment of "Not Rated."
Managed by the Natural Resources Conservation Service, Simons Bros. has not been rated for its emergency action plan readiness or risk assessment measures. Despite lacking recent inspection and assessment dates, this dam remains under state jurisdiction with permitting, inspection, and enforcement protocols in place. With a maximum discharge of 1200 cubic feet per second, the dam continues to serve its intended function while maintaining a steady normal storage capacity of 35 acre-feet.
This South Dakota dam, situated in a remote location with no designated city, falls under the St. Paul District of the US Army Corps of Engineers. Although Simons Bros. lacks specific details regarding its associated structures and operational features, its presence contributes to the local water resource management efforts alongside other essential conservation projects in the area.
Year Completed |
1952 |
Dam Length |
520 |
Dam Height |
17 |
River Or Stream |
TR-GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
17 |
Nid Storage |
65 |
Hazard Potential |
Low |
Nid Height |
17 |
Seasonal Comparison
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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.
Simons Bros.