Leonard-Werner No.1 Reservoir Report
Nearby: Leonard-Werner No 2 Leonard-Werner
Last Updated: December 6, 2025
Leonard-Werner No.1, located in Calvin, Oklahoma, is a privately owned earth dam completed in 1979 for purposes beyond flood control or water supply.
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Summary
This structure stands at a height of 25 feet, with a hydraulic height of 16 feet, and a length of 400 feet. It has a storage capacity of 110 acre-feet and a maximum discharge rate of 1154 cubic feet per second. The dam is regulated by the Oklahoma Water Resources Board and undergoes regular inspections and enforcement to ensure its safety and compliance with state regulations.
Despite being classified as having an undetermined hazard potential and not yet rated for its condition, Leonard-Werner No.1 poses a very high risk due to its critical location and structural features. The dam features a controlled spillway with a width of 1 foot and is equipped with a single valve outlet gate. Its risk management measures, emergency action plan, and inundation maps status are currently unspecified, highlighting the importance of ongoing monitoring and assessment to mitigate potential risks associated with this essential water resource infrastructure.
As part of the Tulsa District, Leonard-Werner No.1 is a key component of the local water management system, serving the community and surrounding areas in Hughes County, Oklahoma. With its significant storage capacity and strategic positioning along the TR-Little River, this dam plays a crucial role in regulating water flow and supporting agricultural, industrial, and environmental activities in the region. For water resource and climate enthusiasts, understanding the complexities and risks associated with structures like Leonard-Werner No.1 is essential for ensuring sustainable water management and resilience in the face of changing climate conditions.
Year Completed |
1979 |
Dam Length |
400 |
Dam Height |
25 |
River Or Stream |
TR-LITTLE RIV |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Nid Storage |
110 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Undetermined |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little River Near Sasakwa
|
12cfs |
Canadian River At Calvin
|
361cfs |
North Canadian River Near Wetumka
|
209cfs |
Little River Near Tecumseh
|
8cfs |
North Canadian River At Shawnee
|
177cfs |
Blue River Near Connerville
|
54cfs |
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.
Leonard-Werner No.1