Lenhart Reservoir Report
Nearby: Rackley Dorothy Wares Iona
Last Updated: December 13, 2025
Lenhart, a privately owned dam located in Woods County, Oklahoma, is regulated by the Oklahoma Water Resources Board.
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Summary
Completed in 1960, this earth dam stands at a height of 30 feet and has a storage capacity of 270 acre-feet. It serves as a crucial structure on the TR Yellowstone Creek, with a controlled spillway and one outlet valve for water discharge.
Despite being classified as having low hazard potential, Lenhart is considered to have a very high risk assessment, indicating potential risks that may require careful monitoring and management. The dam has not been rated for its condition assessment, and the last inspection was conducted in 2010. However, with a history of state regulation, inspection, and enforcement, Lenhart remains a key infrastructure for water resource and climate management in the region.
Overall, Lenhart's significance lies not only in its storage and flood control capabilities but also in its role in water resource management in Oklahoma. As a privately owned structure with state jurisdiction and regulation, its operation and maintenance are critical for ensuring the safety and sustainability of the surrounding area's water supply and ecosystem.
Year Completed |
1960 |
Dam Length |
450 |
Dam Height |
30 |
River Or Stream |
TR YELLOWSTONE CR |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
20 |
Nid Storage |
270 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cimarron River Near Buffalo
|
81cfs |
Salt Fork Arkansas River Nr Alva
|
94cfs |
Cimarron R Near Buttermilk
|
47cfs |
Bluff Creek Nr Buttermilk
|
41cfs |
Cimarron River Near Waynoka
|
103cfs |
Medicine Lodge R Nr Kiowa
|
110cfs |
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.
Lenhart