Winn Exploration Dam No 1 Reservoir Report

Last Updated: December 6, 2025

Winn Exploration Dam No 1, located in Maverick County, Texas, is a privately owned earth dam completed in 1960 with a primary purpose of fire protection, stock, or small fish pond.


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Summary

The dam stands at a height of 24 feet and stretches 1850 feet in length, creating a storage capacity of 3070 acre-feet and covering a surface area of 237 acres. The dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections, with the last one conducted in January 2010.

The dam, situated on Rosita Creek, serves as a vital water resource for the local community, providing water for fire protection and recreational purposes. With a moderate risk assessment rating of 3, the dam is considered to have a manageable hazard potential. The spillway, which is uncontrolled and 346 feet wide, allows for the safe release of excess water during heavy rainfall events. The dam's condition is currently not rated, but it meets state regulatory requirements and is equipped with five uncontrolled outlet gates.

Overall, Winn Exploration Dam No 1 plays a crucial role in water management and conservation efforts in Maverick County, Texas. Its strategic location on Rosita Creek ensures a reliable water supply for various purposes while also offering recreational opportunities for the local community. With proper maintenance and adherence to state regulations, the dam continues to serve as a valuable asset for the area's water resource and climate enthusiasts.

Year Completed

1960

Dam Length

1850

Dam Height

24

River Or Stream

ROSITA CREEK

Primary Dam Type

Earth

Surface Area

237

Hydraulic Height

24

Drainage Area

9.85

Nid Storage

3070

Structural Height

24

Outlet Gates

Uncontrolled - 5

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

24
       
Seasonal Comparison

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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.