Gill Reservoir Report

Last Updated: December 6, 2025

Gill, located in Coalgate, Oklahoma, is a privately owned dam that serves the primary purpose of flood risk reduction along the TR-Coon Creek.


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Summary

Built in 1950, this earth dam stands at 15 feet in height and stretches 400 feet in length, with a storage capacity of 80 acre-feet. Despite being rated as having a low hazard potential, the risk assessment for Gill indicates a very high risk level, emphasizing the importance of ongoing monitoring and maintenance.

Managed by the Oklahoma Water Resources Board (OWRB), Gill is subject to state regulation, inspection, and enforcement to ensure its structural integrity and operational effectiveness. Although its condition assessment is currently listed as "Not Rated," the dam is equipped with a controlled spillway and a single valve outlet gate for water release. With a history of regular inspections dating back to April 2003, Gill's emergency action plan status and risk management measures are currently unspecified, suggesting room for improvement in emergency preparedness and response.

As climate change continues to impact water resources and increase the frequency and intensity of extreme weather events, the significance of infrastructure like Gill in mitigating flood risks cannot be understated. Climate enthusiasts and water resource professionals alike may find Gill's data and risk profile a compelling case study in the intersection of dam safety, emergency planning, and climate resilience.

Year Completed

1950

Dam Length

400

Dam Height

15

River Or Stream

TR-COON CREEK

Primary Dam Type

Earth

Surface Area

12

Hydraulic Height

15

Nid Storage

80

Structural Height

15

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

15
       
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.