Humphrey L.L. Reservoir Report
Last Updated: January 12, 2026
Humphrey L.L.
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Summary
is a privately owned earth dam located in Stephens, Oklahoma, near the city of Thomas School. Built in 1970, this dam stands at a height of 25 feet and has a hydraulic height of 22 feet. With a capacity to store 66 acre-feet of water, it serves as a crucial structure for managing water resources in the area. The dam is regulated by the Oklahoma Water Resources Board and undergoes regular inspections to ensure its safety and functionality.
The primary purpose of Humphrey L.L. dam is categorized as "Other," with a low hazard potential and a very high risk assessment rating. The dam features a controlled spillway and a single valve outlet gate. While it has not been rated for its current condition, the dam remains an important asset for water management in the region. Despite not being owned or funded by any federal agencies, Humphrey L.L. plays a significant role in mitigating flood risks and providing water storage for agricultural and municipal purposes.
With its close proximity to the TR Fitzpatrick Creek, Humphrey L.L. serves as a vital component of the local water infrastructure. While its risk assessment is high, the dam's low hazard potential indicates that it continues to operate safely. As climate change impacts water resources, structures like Humphrey L.L. are essential for ensuring water availability and flood control in the region.
Year Completed |
1970 |
Dam Length |
460 |
Dam Height |
25 |
River Or Stream |
TR FITZPATRICK CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
22 |
Nid Storage |
66 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
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.
Humphrey L.L.