M.A. Lynch Reservoir Report
Nearby: Glad Valley L. Barnica
Last Updated: December 7, 2025
M.A.
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Summary
Lynch is a privately owned dam located in Corson, South Dakota, on the TR-Black Horse Creek. Built in 1941, this earth dam stands at a height of 23 feet and has a length of 380 feet, providing a storage capacity of 276 acre-feet. Despite its low hazard potential, the dam is regulated by the South Dakota Department of Environment and Natural Resources (DENR) and undergoes regular inspections, permitting, and enforcement to ensure its safety and compliance with state regulations.
The primary purpose of M.A. Lynch dam is not specified, but it serves as a crucial infrastructure for water resource management in the area. With a maximum discharge capacity of 3,528 cubic feet per second, the dam helps mitigate flood risks and provides essential water storage for agricultural, industrial, and municipal needs. Although the dam's condition assessment is currently not rated, it remains a key component of the local water management system, contributing to the overall resilience of the region in the face of changing climate patterns.
Represented by Congressman Dusty Johnson (R), M.A. Lynch dam plays a vital role in ensuring water security and climate adaptation in South Dakota. As water resource and climate enthusiasts, it is essential to monitor and support the ongoing maintenance and management of dams like M.A. Lynch to safeguard water availability and resilience in the face of evolving environmental challenges.
Year Completed |
1941 |
Dam Length |
380 |
Dam Height |
23 |
River Or Stream |
TR-BLACK HORSE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
23 |
Nid Storage |
276 |
Hazard Potential |
Low |
Nid Height |
23 |
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.
M.A. Lynch