Fort Gibson Dam - Dike 8 Reservoir Report
Last Updated: December 22, 2025
Fort Gibson Dam - Dike 8, also known as Fort Gibson Lake, is a gravity dam located on the Grand River in Wagoner, Oklahoma.
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Summary
Constructed in 1949 by the US Army Corps of Engineers, this dam stands at 110 feet tall and spans 2990 feet in length, with a storage capacity of 1,284,400 acre-feet. Its primary purpose is flood risk reduction, with a hazard potential rated as high and a risk assessment indicating very high risk.
The US Army Corps of Engineers manages the dam’s flood risk by monitoring its condition, prioritizing necessary actions, and collaborating with local emergency managers and the public to raise awareness and preparedness in case of a dam-related emergency. The dam has a controlled spillway with a width of 1490 feet, and its risk management measures include continuous maintenance, regular updates to the emergency action plan, and coordination with local authorities for emergency response planning. Despite the dam’s efforts to mitigate flooding, the risk of overflow during severe weather events remains a concern, prompting ongoing monitoring and risk assessment activities by the USACE.
In conclusion, Fort Gibson Dam - Dike 8 plays a crucial role in managing flood risk along the Grand River, with the US Army Corps of Engineers implementing strategies to ensure the dam’s structural integrity and readiness for emergencies. As water resource and climate enthusiasts, it is important to recognize the complex challenges and responsibilities involved in dam operation and maintenance, especially in the face of changing weather patterns and increased flood risks.
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
Weather Forecast
Nearby Streamflow Levels
Arkansas River Near Muskogee
|
4810cfs |
Arkansas River Near Haskell
|
3300cfs |
Illinois River Near Tahlequah
|
357cfs |
Neosho River Near Chouteau
|
631cfs |
Illinois River Near Gore
|
98cfs |
Baron Fork At Eldon
|
51cfs |
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.
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