Fort Gibson Dam - Dike 1 Reservoir Report

Last Updated: December 22, 2025

Fort Gibson Dam - Dike 1, located in Fort Gibson, Oklahoma, is a federal-owned structure managed by the US Army Corps of Engineers.


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Summary

Completed in 1949, this gravity dam stands at 110 feet tall and has a maximum storage capacity of 1,284,400 acre-feet. It serves the primary purpose of flood risk reduction on the Grand River, with a spillway width of 1,490 feet to manage high water levels.

With a high hazard potential, Fort Gibson Dam - Dike 1 is regularly inspected and has an emergency action plan in place to address any potential risks. The US Army Corps of Engineers works diligently to monitor and manage flood risks associated with the dam, engaging with emergency managers and the public to raise awareness and ensure preparedness for any dam-related emergencies. Maintenance and repairs are performed as needed to uphold the dam's structural integrity and functionality.

As a crucial component in managing water levels and flood risks in the region, Fort Gibson Dam - Dike 1 plays a vital role in protecting communities and infrastructure along the Grand River. With a focus on risk management and public safety, the US Army Corps of Engineers remains dedicated to the ongoing maintenance and monitoring of this key water resource structure.

Year Completed

1949

Dam Length

2990

Dam Height

110

River Or Stream

GRAND RIVER

Primary Dam Type

Gravity

Surface Area

19900

Hydraulic Height

99

Drainage Area

12494

Nid Storage

1284400

Structural Height

110

Hazard Potential

High

Nid Height

110
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.