Fort Gibson Dam - Dike 2 Reservoir Report

Last Updated: December 22, 2025

Fort Gibson Dam - Dike 2, also known as Fort Gibson Lake, is a gravity dam located on the Grand River in Wagoner, Oklahoma.


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Summary

Built in 1949 by the US Army Corps of Engineers, the dam stands at 110 feet in height and spans 2990 feet in length. Its primary purpose is flood risk reduction, with a storage capacity of 1,284,400 acre-feet and a maximum discharge of 986,000 cubic feet per second.

With a hazard potential rated as high, the dam is regularly inspected and monitored to ensure its structural integrity and functionality. The US Army Corps of Engineers implements risk management measures to address all types of flood risks associated with the dam, including collaborating with local emergency managers and developing emergency action plans. Despite its critical role in flood control, the dam's limited capacity to store water means that releases may be necessary to manage water levels and relieve pressure during severe weather events.

Overall, Fort Gibson Dam - Dike 2 serves as a vital infrastructure for flood risk reduction in the region, showcasing the ongoing efforts and commitment by the US Army Corps of Engineers to ensure the safety and resilience of the dam and surrounding communities in the face of potential dam-related emergencies.

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.