Cook Gss Reservoir Report

Last Updated: December 6, 2025

Cook Gss is a privately owned earth dam located on the Dry Fork Washita River in Hemphill, Texas.


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Summary

Built in 1977 by the USDA NRCS, this dam stands at a height of 25 feet and spans 1745 feet in length, with a storage capacity of 162 acre-feet. Its primary purpose is flood risk reduction, serving as a crucial structure in protecting the surrounding area from potential flooding events.

Despite being designated as a high-risk structure with a hazard potential rating of 2, Cook Gss has not been rated for its condition assessment. The dam does not have a spillway and is equipped with one outlet gate. While it is not under state jurisdiction or regulation, it is subject to state permitting and inspection requirements. The dam is in the Tulsa District and is not owned or funded by any federal agency.

Water resource and climate enthusiasts may find Cook Gss to be an intriguing example of a privately owned dam designed for flood risk reduction. Its location on the Dry Fork Washita River in Texas, along with its unique design features and storage capacity, make it a significant structure in the region. Despite its high-risk classification, the dam continues to play a crucial role in managing water flow and protecting the local community from potential flooding events.

Year Completed

1977

Dam Length

1745

Dam Height

25

River Or Stream

DRY FORK WASHITA RIVER

Primary Dam Type

Earth

Hydraulic Height

25

Nid Storage

162

Structural Height

25

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

25
       
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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