Tapley John Reservoir Report
Last Updated: December 6, 2025
Tapley John, located in McCurtain, Oklahoma, is a privately owned dam that serves multiple purposes, including water resource management.
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Summary
Built in 1950, this earth dam stands at a height of 21 feet and has a maximum storage capacity of 90 acre-feet. The dam, situated on TR-MUD CR river, has a controlled spillway and a low hazard potential.
Despite being a privately owned structure, Tapley John is regulated by the Oklahoma Water Resources Board and undergoes regular inspections to ensure safety and compliance. The dam is equipped with a single valve outlet gate and has a very high risk assessment rating, indicating the importance of effective risk management measures. With a surface area of 10 acres and a drainage area not specified, Tapley John plays a crucial role in the local water infrastructure.
In the event of an emergency, Tapley John has a designated emergency action plan (EAP) in place, though details about its preparation and adherence to guidelines are not provided. The dam's condition assessment is listed as "Not Rated," suggesting a need for further evaluation. With a history dating back to the mid-20th century and a congressional representative in the form of Markwayne Mullin (R), Tapley John remains a significant water resource structure in the region, warranting continued monitoring and maintenance.
Year Completed |
1950 |
Dam Length |
350 |
Dam Height |
21 |
River Or Stream |
TR-MUD CR |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
17 |
Nid Storage |
90 |
Structural Height |
21 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
21 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little River Blw Lukfata Creek
|
572cfs |
Red River Near De Kalb
|
1160cfs |
Mountain Fork Near Eagletown
|
2040cfs |
Glover River Near Glover
|
342cfs |
Little River Near Horatio
|
3450cfs |
Cuthand Ck At Fm 910 Nr Cuthand
|
0cfs |
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.
Tapley John