Rocking Chair Tank Dam Reservoir Report

Last Updated: December 5, 2025

Rocking Chair Tank Dam, located in McMullen County, Texas, is a private earth dam primarily used for water supply from TR-Bill Walker Creek.


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Summary

Built in 1968, this dam stands at a height of 18 feet and spans 880 feet in length, with a storage capacity of 520 acre-feet. Despite its modest size, the dam plays a crucial role in water resource management in the region.

Managed by the Texas Commission on Environmental Quality (TCEQ), Rocking Chair Tank Dam is subject to state regulations, inspections, and enforcement to ensure its safety and efficiency. With no spillway and a hazard potential not yet rated, the dam's risk assessment is classified as high. While the dam's condition is currently not rated, it remains a vital asset for water supply in the area, highlighting the importance of proper maintenance and risk management.

Representing a key piece of infrastructure for water resource management, Rocking Chair Tank Dam serves as a reminder of the intricate balance between water supply, regulatory oversight, and risk assessment in the face of changing climate conditions. As climate enthusiasts and water resource advocates, it is crucial to monitor and support the upkeep of such structures to ensure sustainable water management for future generations.

Year Completed

1968

Dam Length

880

Dam Height

18

River Or Stream

TR-BILL WALKER CREEK

Primary Dam Type

Earth

Surface Area

30

Hydraulic Height

18

Nid Storage

520

Structural Height

18

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

18
       
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.