John Paul Hinz Reservoir Report

Last Updated: December 6, 2025

John Paul Hinz, located in Washita County, Oklahoma, is a privately owned dam designed by the NRCS and regulated by the OWRB.


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Summary

Completed in 1983, this structure on Gyp Creek stands at a height of 27 feet and spans 382 feet in length. With a storage capacity of 68 acre-feet and a surface area of 2 acres, the dam serves multiple purposes and has a low hazard potential.

Despite being classified as low risk, John Paul Hinz has a very high risk assessment rating of 1 out of 5. While the dam has not been rated for condition assessment, it undergoes inspection every 5 years to ensure its safety and functionality. Although not equipped with outlet gates or locks, the dam features a controlled spillway with a width of 1 foot.

Overall, John Paul Hinz is a vital water resource in Oklahoma, providing essential storage and flood control benefits. With its intricate design and regulated maintenance, this dam continues to play a significant role in water management efforts within the region.

Year Completed

1983

Dam Length

382

Dam Height

27

River Or Stream

GYP CREEK

Surface Area

2

Drainage Area

0.75

Nid Storage

68

Hazard Potential

Low

Nid Height

27
       
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.