Coppedge Jack Reservoir Report
Nearby: Oknoname 063028 David L Mcmahan
Last Updated: December 6, 2025
Coppedge Jack is a privately owned earth dam located in Hughes County, Oklahoma, along the Canadian River.
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Summary
Built in 1977 by the USDA NRCS, this 35-foot high structure serves various purposes, including flood control and water resource management. With a storage capacity of 350 acre-feet and a controlled spillway, the dam has a low hazard potential and is inspected regularly by the OWRB to ensure its safety and integrity.
Managed by the Natural Resources Conservation Service, Coppedge Jack is considered a vital infrastructure in the region, with a maximum discharge capacity of 2325 cubic feet per second. Despite its age, the dam remains in good condition, with a very high risk assessment rating of 1. While not federally owned or funded, the dam plays a crucial role in water regulation and conservation efforts along the Canadian River, making it an essential asset for climate and water resource enthusiasts to monitor and study.
With its primary purpose being classified as "Other", Coppedge Jack stands as a testament to effective earth dam construction and management. Located in Calvin, Oklahoma, the structure is regulated and inspected by the OWRB, ensuring that it meets state standards for safety and functionality. As a key component in the region's water infrastructure, Coppedge Jack serves as a valuable resource for researchers and enthusiasts interested in the intersection of water resources and climate change adaptation.
Year Completed |
1977 |
Dam Length |
230 |
Dam Height |
35 |
River Or Stream |
TR.CANADIAN RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
30 |
Nid Storage |
350 |
Structural Height |
35 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Canadian River At Calvin
|
361cfs |
Little River Near Sasakwa
|
12cfs |
North Canadian River Near Wetumka
|
209cfs |
Little River Near Tecumseh
|
8cfs |
North Canadian River At Shawnee
|
177cfs |
Blue River Near Connerville
|
54cfs |
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.
Coppedge Jack