Jolley Lake Dam Reservoir Report

Last Updated: December 5, 2025

Jolley Lake Dam, located in Brown County, Texas, is a private earth dam built in 1976 for the primary purpose of water supply.


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Summary

Standing at a height of 20 feet and with a length of 330 feet, this dam holds a maximum storage capacity of 120 acre-feet of water, with a normal storage level of 47 acre-feet. The dam is situated on the TR-Cottonwood Branch river or stream, within the Fort Worth District of the US Army Corps of Engineers.

Despite being privately owned, Jolley Lake Dam is subject to state permitting and inspection requirements, ensuring its safety and compliance with regulations. While the dam does not have a spillway, it is equipped with one outlet gate. The dam's hazard potential is categorized as "Not Available," with a risk assessment rating of "High (2)." The condition assessment is listed as "Not Rated," suggesting the need for further evaluation and monitoring.

For water resource and climate enthusiasts, Jolley Lake Dam serves as a vital infrastructure for water supply in the region. Its design and construction details, coupled with its risk assessment and hazard potential, offer valuable insights into the dam's functionality and safety measures. As a key component of the local water management system, Jolley Lake Dam plays a crucial role in ensuring water availability and security for the surrounding community.

Year Completed

1976

Dam Length

330

Dam Height

20

River Or Stream

TR-COTTONWOOD BRANCH

Primary Dam Type

Earth

Hydraulic Height

20

Nid Storage

120

Structural Height

20

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

20
       
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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.