Fort Supply Dam Reservoir Report
Nearby: Cooper Gp #8 Cooper Gp #6
Last Updated: December 21, 2025
Fort Supply Dam, also known as Fort Supply Lake, is a Federal-owned structure located in Woodward, Oklahoma.
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Summary
Built in 1942 by the US Army Corps of Engineers, the dam serves primarily for Flood Risk Reduction purposes and also offers recreational opportunities. This Earth-type dam stands at a height of 85 feet and has a storage capacity of 100,700 acre-feet, with a maximum discharge of 210,000 cubic feet per second. The dam's spillway, with a width of 540 feet, is uncontrolled.
The risk assessment conducted by the USACE in 2018 classified the risk associated with Fort Supply Dam as moderate, primarily due to the potential for water to flow over the embankment crest during extreme storms, leading to embankment erosion and breach. In case of a dam failure, communities along the North Canadian River, including Fort Supply, Woodward, and Oklahoma City, could be impacted. To manage this risk, USACE conducts regular emergency exercises, updates the Emergency Action Plan (EAP), and maintains a detailed communication plan. The dam also undergoes continuous monitoring and maintenance to ensure its structural integrity and early detection of safety concerns.
Overall, Fort Supply Dam plays a crucial role in flood risk reduction in the region, but it also poses potential hazards to downstream communities. Through proactive risk management measures and ongoing monitoring, the US Army Corps of Engineers aims to safeguard the dam's integrity and ensure the safety of surrounding areas in the event of severe flooding scenarios.
Year Completed |
1942 |
Dam Length |
12625 |
Dam Height |
85 |
River Or Stream |
WOLF CREEK |
Primary Dam Type |
Earth |
Surface Area |
1820 |
Hydraulic Height |
75 |
Drainage Area |
1735 |
Nid Storage |
100700 |
Structural Height |
85 |
Outlet Gates |
Vertical Lift - 0 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
85 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Canadian River At Woodward
|
68cfs |
Cimarron River Near Buffalo
|
75cfs |
Cimarron R Near Buttermilk
|
44cfs |
Bluff Creek Nr Buttermilk
|
39cfs |
Cimarron River Near Waynoka
|
129cfs |
North Canadian River Near Seiling
|
103cfs |
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.
Fort Supply Dam