Hill J.T. Estate Reservoir Report

Last Updated: December 7, 2025

Hill J.T.


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Summary

Estate is a private dam located in Stephens, Oklahoma, along Dry Creek. Built in 1975, this earth dam stands at 44 feet high and stretches 572 feet in length, providing a storage capacity of 174 acre-feet. The dam's primary purpose is listed as "Other," with a low hazard potential and a very high risk assessment rating. Despite being state-regulated and inspected, its condition assessment remains unrated.

Managed by the OWRB and situated within the Tulsa District, Hill J.T. Estate's spillway is controlled with a width of 1 foot, and it features a single valve outlet gate. The dam poses a very high risk, and although it has been inspected in 2005 with a frequency of 5 years, its emergency action plan status and risk management measures are currently undisclosed. With its unique design and functional specifications, this dam serves as a critical water resource and climate element in the region, attracting enthusiasts and stakeholders alike.

Year Completed

1975

Dam Length

572

Dam Height

44

River Or Stream

DRY CREEK

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

40

Nid Storage

174

Structural Height

44

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

44
       
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.
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