Koehn Reservoir Report
Last Updated: December 5, 2025
Koehn is a privately owned earth dam located in Putnam, Dewey County, Oklahoma.
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Summary
Built in 1976 by the USDA NRCS, this dam stands at a height of 25 feet and has a length of 98 feet, with a storage capacity of 30 acre-feet. It serves a primary purpose of "Other" and is classified as a low hazard potential structure with a moderate risk assessment rating.
The dam features an uncontrolled spillway with a width of 23 feet and is situated on an unnamed river or stream in the Tulsa District. Despite being privately owned, Koehn does not fall under state jurisdiction for regulation, permitting, inspection, or enforcement. Furthermore, it has not been rated for its condition assessment and lacks an emergency action plan.
Water resource and climate enthusiasts will find Koehn to be an intriguing structure due to its unique design and purpose, as well as its location in a rural area with limited drainage area. The dam's moderate risk assessment rating suggests the need for continued monitoring and potential risk management measures to ensure the safety and integrity of this vital water resource in Dewey County, Oklahoma.
Year Completed |
1976 |
Dam Length |
98 |
Dam Height |
25 |
River Or Stream |
UNNAMED |
Primary Dam Type |
Earth |
Surface Area |
2 |
Hydraulic Height |
25 |
Drainage Area |
0.19 |
Nid Storage |
30 |
Hazard Potential |
Low |
Nid Height |
25 |
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.
Koehn