Cotner D.D. Reservoir Report

Last Updated: December 5, 2025

Cotner D.D.


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Summary

is a privately owned earth dam located in Sapulpa, Oklahoma, along the TR-Polecat Creek. Completed in 1970, this dam serves primarily for recreation purposes, offering a storage capacity of 90 acre-feet and a maximum discharge of 2700 cubic feet per second. With a height of 30 feet and a length of 630 feet, Cotner D.D. is regulated and inspected by the OWRB, ensuring its safety and compliance with state regulations.

Despite being rated as having a low hazard potential, Cotner D.D. poses a very high risk according to a risk assessment, which emphasizes the importance of proper risk management measures. The dam features a controlled spillway and a single valve outlet gate. While its condition is currently not rated, regular inspections have been conducted, with the last one taking place in August 2011. The dam is designed to withstand hydraulic pressures and is supported by a stone core and soil foundation.

Located within the Tulsa District, Cotner D.D. is situated in Creek County, Oklahoma, and falls under the jurisdiction of the state regulatory agency OWRB. With its recreational purpose and potential risk, this dam stands as a vital structure in the region, highlighting the importance of water resource and climate enthusiasts in monitoring and ensuring the safety and integrity of such critical infrastructure.

Year Completed

1970

Dam Length

630

Dam Height

30

River Or Stream

TR-POLECAT CREEK

Primary Dam Type

Earth

Hydraulic Height

30

Nid Storage

90

Structural Height

30

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

30
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.