Gr Overton Reservoir Report
Nearby: Overton Russell Sherrill Rufus No 1
Last Updated: January 2, 2026
Gr Overton is a private earth dam located in Vinson, Oklahoma, on the Elm Fork of the Red River.
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Summary
Constructed in 1991 by the USDA NRCS, this dam stands at a height of 25 feet and has a storage capacity of 90 acre-feet. Its primary purpose is flood risk reduction, with a low hazard potential and a very high risk assessment rating. The dam is regulated and inspected by the Oklahoma Water Resources Board, ensuring its structural integrity and safety for surrounding communities.
Despite being classified as "Not Rated" in terms of condition assessment, Gr Overton has a controlled spillway and one outlet valve. The dam's drainage area is 0.8 square miles, with a maximum discharge of 470 cubic feet per second. The surrounding area is under the jurisdiction of the Oklahoma state regulatory agency, with enforcement, permitting, and inspection processes in place to maintain the dam's functionality. With its strategic location and design, Gr Overton plays a crucial role in managing flood risk in the region and protecting downstream communities from potential flooding events.
Year Completed |
1991 |
Dam Length |
50 |
Dam Height |
25 |
River Or Stream |
ELM FORK OF THE RED RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
0.8 |
Nid Storage |
90 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Gr Overton