Mercer John A Reservoir Report
Nearby: Glimp He Whitehead Ee
Last Updated: December 6, 2025
Mercer John A is a privately owned earth dam located in Creek, Oklahoma, along TR-Polecat Creek.
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Summary
Built in 1960 for recreational purposes, this 27-foot tall structure boasts a length of 440 feet and a storage capacity of 130 acre-feet. Although the dam is primarily used for recreation, it is also regulated by the Oklahoma Water Resources Board and undergoes regular inspections, with the last one conducted in August 2011.
Despite its low hazard potential, Mercer John A is deemed to have a very high risk level, given its age and the potential consequences of failure. While the dam's condition is currently not rated, emergency action plans have not been prepared or updated. It is crucial for the owners to address these issues and implement risk management measures to ensure the safety of downstream communities and the surrounding environment. Considering the increasing impacts of climate change on water resources, it is essential for stakeholders to prioritize the maintenance and safety of structures like Mercer John A to mitigate potential disasters and protect the local ecosystem.
Year Completed |
1960 |
Dam Length |
440 |
Dam Height |
27 |
River Or Stream |
TR-POLECAT CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
27 |
Nid Storage |
130 |
Structural Height |
27 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
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.
Mercer John A