Oknoname 111027 Reservoir Report
Nearby: Oknoname 111030 Oknoname 111028
Last Updated: December 5, 2025
Oknoname 111027 is a privately owned dam located in Okmulgee County, Oklahoma, near the city of Blad Hill.
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Summary
It stands at a height of 21 feet and has a length of 310 feet, with a primary purpose classified as "Other". The dam, completed in 1950, is an earth dam with a stone core and soil foundation, serving as a structure on TR-Coal Creek.
The dam has a storage capacity of 50 acre-feet and a maximum discharge of 1170 cubic feet per second. It features a controlled spillway with a width of 1 foot and one valve outlet gate. Despite being classified as having a low hazard potential, the dam is deemed to have a very high risk due to unspecified factors (Risk Assessment: Very High). The last inspection conducted in 2011 rated the dam's condition as "Not Rated".
The dam is under the jurisdiction of the Oklahoma Water Resources Board (OWRB), with state-regulated permitting, inspection, and enforcement in place. Although the risk level is high, there is currently no Emergency Action Plan (EAP) prepared, and the dam does not meet EAP guidelines. With a unique history and characteristics, Oknoname 111027 presents an intriguing case study for water resource and climate enthusiasts interested in dam infrastructure and risk management.
Year Completed |
1950 |
Dam Length |
310 |
Dam Height |
21 |
River Or Stream |
TR-COAL 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.
Oknoname 111027