Thompson Mg Reservoir Report
Last Updated: December 5, 2025
Thompson Mg, located in Edna, Oklahoma, is a privately owned dam that serves the primary purpose of flood risk reduction along the TR-Browns Creek.
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Summary
Built in 1940, this earth dam stands at 21 feet high and stretches 470 feet in length, with a storage capacity of 50 acre-feet. Despite its low hazard potential, the dam is state-regulated and subject to regular inspections by the Oklahoma Water Resources Board to ensure its structural integrity and safety.
The dam features a controlled spillway and a single outlet gate for water release, with a maximum discharge capacity of 90 cubic feet per second. While its condition assessment is currently listed as "Not Rated," Thompson Mg has a risk assessment rating of "Very High (1)," indicating potential vulnerabilities that may require further risk management measures in the future. This dam, situated in Okmulgee County, plays a crucial role in managing water resources and mitigating flood risks in the surrounding area.
As a key component of the flood control infrastructure in the region, Thompson Mg is an essential asset for water resource and climate enthusiasts interested in understanding the management and regulation of dams in Oklahoma. With its historical significance and ongoing maintenance efforts, this dam exemplifies the intersection of engineering, environmental stewardship, and public safety in the face of natural disasters and changing climate conditions. Thompson Mg stands as a testament to the importance of proactive risk assessment and management in safeguarding water resources and communities against the impacts of flooding.
Year Completed |
1940 |
Dam Length |
470 |
Dam Height |
21 |
River Or Stream |
TR-BROWNS CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
21 |
Nid Storage |
50 |
Structural Height |
21 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
21 |
Seasonal Comparison
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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.
Thompson Mg