Koch Dam Reservoir Report
Nearby: Abernathy Dam Hayes Stockwater Dam
Last Updated: December 12, 2025
Koch Dam, also known as Cooks Dam, is a state-owned structure located in Buffalo, South Dakota, along the tributary of Crow Creek.
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Summary
Built by the WPA in 1934, this earth dam stands at a height of 24 feet and stretches out over 400 feet in length. With a maximum storage capacity of 300 acre-feet and a normal storage of 150 acre-feet, Koch Dam plays a crucial role in regulating water flow and providing irrigation for the surrounding area.
Despite being categorized as a low hazard potential structure, Koch Dam is subject to regular state inspections and enforcement to ensure its continued safety and functionality. The dam features an uncontrolled spillway with a width of 40 feet, capable of handling a maximum discharge of 1200 cubic feet per second. With a moderate risk assessment rating, measures for risk management are in place to address any potential issues that may arise.
For water resource and climate enthusiasts, Koch Dam offers a fascinating glimpse into the history and engineering of water management in South Dakota. Its strategic location and purposeful design make it a vital component of the local ecosystem, serving both agricultural and conservation needs in the region. As efforts continue to monitor and maintain the dam, its role in water resource management remains essential for the community it serves.
Year Completed |
1934 |
Dam Length |
400 |
Dam Height |
24 |
River Or Stream |
TRIB. CROW CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Drainage Area |
3 |
Nid Storage |
300 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
White R Near Oacoma Sd
|
105cfs |
James R At Huron Sd
|
548cfs |
Firesteel Cr Near Mount Vernon Sd
|
0cfs |
James R Near Forestburg Sd
|
560cfs |
Platte Creek Near Platte
|
3cfs |
James R Near Redfield Sd
|
468cfs |
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.
Koch Dam