Humphrey L.L. Reservoir Report

Last Updated: December 8, 2025

Humphrey L.L.


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Summary

is a privately owned dam located in Stephens, Oklahoma, along the TR Fitzpatrick Creek. Built in 1970 for flood risk reduction, this Earth dam stands at a height of 19 feet and has a storage capacity of 50 acre-feet. With a controlled spillway and a maximum discharge of 620 cubic feet per second, Humphrey L.L. plays a crucial role in managing water levels and protecting the surrounding area from potential flooding.

Despite being classified as a low hazard potential structure, Humphrey L.L. is subject to regular inspections and maintenance to ensure its structural integrity and functionality. The dam features a single valve outlet gate and is regulated by the Oklahoma Water Resources Board. With a very high risk assessment rating, measures are in place to mitigate any potential risks associated with the dam and to ensure the safety of the community it serves.

Located near the city of Thomas School, Humphrey L.L. is monitored for any changes in condition or risk level. With a commitment to flood risk reduction and water resource management, this dam serves as a vital piece of infrastructure in the region, safeguarding against potential flooding events and protecting the local ecosystem.

Year Completed

1970

Dam Length

400

Dam Height

19

River Or Stream

TR FITZPATRICK CREEK

Primary Dam Type

Earth

Hydraulic Height

15

Nid Storage

50

Structural Height

19

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

19
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.