Oknoname 059012 Reservoir Report
Last Updated: December 22, 2025
Oknoname 059012 is a state-regulated earth dam located in Harper, Oklahoma, with a primary purpose classified as "Other" and designed by the USDA NRCS.
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Summary
Completed in 1960 with a height of 25 feet and a length of 380 feet, this dam provides a maximum storage capacity of 270 acre-feet and normal storage of 190 acre-feet. Situated on the TR-Cimarron River, the dam's spillway type is controlled, with a spillway width of 1 foot and a maximum discharge of 620 cubic feet per second.
Despite its low hazard potential and "Not Rated" condition assessment, the risk assessment for Oknoname 059012 is classified as "Very High (1)". The dam is under state jurisdiction and regulatory oversight by the Oklahoma Water Resources Board (OWRB), with state permitting, inspection, and enforcement in place. With the structural height matching the hydraulic height at 25 feet, the dam features a stone core and soil foundation. Notably, the dam's outlet gates consist of a single valve, and the last inspection was conducted in August 2011, with an inspection frequency of 5 years. Overall, Oknoname 059012 serves as a vital water resource management structure in the region, contributing to flood control and water supply management efforts.
Year Completed |
1960 |
Dam Length |
380 |
Dam Height |
25 |
River Or Stream |
TR-CIMARRON RIVER |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
25 |
Nid Storage |
270 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
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Nearby Streamflow Levels
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 059012