Ophornett Martin Reservoir Report
Nearby: Oknoname 111078 Oknoname 111077
Last Updated: December 6, 2025
Ophornett Martin is a privately owned earth dam located in Okmulgee, Oklahoma, specifically in the city of Hoffman.
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Summary
Completed in 1960, this dam stands at a height of 30 feet and has a storage capacity of 50 acre-feet. It serves a primary purpose of "Other" and is regulated by the Oklahoma Water Resources Board (OWRB). The dam is situated on the TR-COAL CREEK river and is under the jurisdiction of the state with permitting, inspection, and enforcement processes in place.
With a spillway type of "Controlled" and a hazard potential rated as "Low", Ophornett Martin poses a relatively low risk of failure. However, the dam has a very high risk assessment rating due to its critical location and the potential consequences of a breach. The last inspection of the dam took place in August 2011, with a scheduled inspection frequency of 5 years. The dam has one outlet gate and is primarily constructed of earth and stone materials, with a length of 3432 feet.
For water resource and climate enthusiasts, Ophornett Martin provides a fascinating case study in dam infrastructure and risk management. Its strategic location, design features, and regulatory oversight by the OWRB make it a valuable asset for water storage and flood control in the region. With a focus on safety and maintenance, this dam serves as a crucial piece of infrastructure in managing water resources in Okmulgee County, Oklahoma.
Year Completed |
1960 |
Dam Length |
3432 |
Dam Height |
30 |
River Or Stream |
TR-COAL CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
30 |
Nid Storage |
50 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
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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.
Ophornett Martin