Broken Bow Dam Reservoir Report
Last Updated: December 19, 2025
Broken Bow Dam, located in Eagletown, Oklahoma, is a federal-owned gravity dam on the Mountain Fork River that serves multiple purposes including flood risk reduction, hydroelectric power generation, recreation, and water supply.
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Summary
Completed in 1968 by the US Army Corps of Engineers, the dam stands at 225 feet tall and stretches 4026 feet in length, with a maximum storage capacity of 1,598,950 acre-feet and a surface area of 20,500 acres. Despite being classified as having a high hazard potential, a risk assessment conducted by the USACE in 2017 deemed the risk associated with the dam as low, primarily driven by the potential for water seepage through rock fractures in the foundation.
To manage the potential risks associated with Broken Bow Dam, the USACE implements various risk management measures. These include conducting emergency exercises with local and state emergency responders, updating the Emergency Action Plan, developing a communication plan, and maintaining the dam through continuous operations and maintenance activities. Additionally, the dam is equipped with a robust instrumentation and monitoring system to evaluate changing conditions and ensure the structure's integrity. In the event of a dam failure, the unincorporated community of Eagletown would face the largest impacts, emphasizing the importance of proactive risk management strategies to safeguard lives and property downstream.
Year Completed |
1968 |
Dam Length |
4026 |
Dam Height |
225 |
River Or Stream |
MOUNTAIN FORK RIVER |
Primary Dam Type |
Gravity |
Surface Area |
20500 |
Hydraulic Height |
220 |
Drainage Area |
754 |
Nid Storage |
1598950 |
Structural Height |
225 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
225 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Mountain Fork Near Eagletown
|
555cfs |
Glover River Near Glover
|
51cfs |
Little River Blw Lukfata Creek
|
177cfs |
Mountain Fork At Smithville
|
10cfs |
Little River Near Horatio
|
608cfs |
Cossatot River Near Vandervoort
|
36cfs |
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.
Broken Bow Dam