Robinson Off-Channel Reservoirs 1a And 1b Reservoir Report

Last Updated: December 5, 2025

Robinson Off-Channel Reservoirs 1a and 1b, located in McLennan County, Texas, were completed in 1992 and are owned by the local government.


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Summary

These reservoirs, with a capacity of 1710 acre-feet, primarily serve as a water supply source for the region. The dams are of earth construction type with a height of 24 feet, and the spillway is uncontrolled with a width of 9 feet. The condition assessment conducted in September 2016 rated the reservoirs as fair and their hazard potential as not available.

Managed by the Texas Commission on Environmental Quality (TCEQ), the Robinson Off-Channel Reservoirs are subject to state regulations and inspections. The dams are designed by WALLACE, WINKLER AND RICE INC and are part of the Brazos River off-channel system. The risk assessment for the reservoirs is moderate (3), indicating a need for ongoing monitoring and risk management measures. The emergency action plan for the reservoirs was last revised in February 2010, and the inspection frequency is every 5 years.

Overall, Robinson Off-Channel Reservoirs 1a and 1b play a crucial role in providing water supply for the local community in McLennan County. With their moderate risk level and fair condition assessment, it is essential for the authorities to continue regular inspections and maintenance to ensure the safety and reliability of these important water resource infrastructure. Climate and water resource enthusiasts will find these reservoirs an interesting example of how local governments work to manage water supply in Texas, especially in the face of changing environmental conditions.

Year Completed

1992

Dam Height

24

River Or Stream

OFF CH-BRAZOS RIVER

Primary Dam Type

Earth

Surface Area

88

Hydraulic Height

24

Nid Storage

1710

Structural Height

24

Outlet Gates

Uncontrolled - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

24
       
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.