Stp Main Cooling Reservoir Dam Reservoir Report

Last Updated: December 6, 2025

The Stp Main Cooling Reservoir Dam, located in Matagorda, Texas, is a privately owned structure that serves as a crucial component of the water resource infrastructure in the area.


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Summary

Completed in 1981, this Earth-type dam stands at a height of 46 feet and has a length of 65,505 feet. With a maximum storage capacity of 250,000 acre-feet and a normal storage capacity of 202,700 acre-feet, this dam plays a vital role in water management and climate regulation in the region.

Managed by the Texas Commission on Environmental Quality (TCEQ), the Stp Main Cooling Reservoir Dam is designed to withstand high discharge rates, with a controlled spillway width of 31 feet. The dam is equipped with two controlled outlet gates, ensuring efficient water flow and management. Despite being classified as having a very high risk potential, the dam has not been rated for its current condition, highlighting the need for regular inspections and maintenance to uphold its structural integrity and safety standards.

Enthusiasts of water resources and climate resilience will appreciate the significance of the Stp Main Cooling Reservoir Dam in maintaining stable water levels, mitigating flood risks, and supporting sustainable water usage in the region. As a critical infrastructure asset, this dam exemplifies the importance of effective dam management practices and regulatory oversight in safeguarding water resources and adapting to changing climate conditions.

Year Completed

1981

Dam Length

65505

Dam Height

46

River Or Stream

OFF CH-COLORADO RIVER

Primary Dam Type

Earth

Surface Area

7000

Hydraulic Height

46

Drainage Area

10.9

Nid Storage

250000

Structural Height

46

Outlet Gates

Other Controlled - 2

Hazard Potential

Not Available

Foundations

Soil

Nid Height

46
       
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.