Oknoname 111045 Reservoir Report
Nearby: Oknoname 111041 Oknoname 111040
Last Updated: December 5, 2025
Oknoname 111045 is a privately-owned dam located in Okmulgee, Oklahoma, specifically in the city of Henryetta.
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Summary
Built in 1940, this earth dam stands at a height of 25 feet and spans a length of 3190 feet, with a storage capacity of 50 acre-feet. The dam is regulated by the Oklahoma Water Resources Board (OWRB) and undergoes regular inspections, with the last inspection dating back to August 2011. The dam's spillway is of the controlled type, with a width of 1 foot, and the hazard potential is classified as low.
Situated on TR-COAL CREEK, Oknoname 111045 serves a primary purpose that is classified as "Other", with the dam type being earth and the core made of stone. The dam's maximum discharge capacity is 310 cubic feet per second and it features a single valve outlet gate. Despite being rated as low hazard potential, the risk assessment for this dam is very high, with a risk level of 1. The dam does not have a Emergency Action Plan (EAP) in place and is not under the jurisdiction of the US Army Corps of Engineers (USACE), thus making it essential for the private owner to ensure proper risk management measures are in place to mitigate any potential hazards.
Year Completed |
1940 |
Dam Length |
3190 |
Dam Height |
25 |
River Or Stream |
TR-COAL CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
25 |
Nid Storage |
50 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
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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.
Oknoname 111045