Lynchburg Reservoir Dam Reservoir Report

Last Updated: December 5, 2025

Lynchburg Reservoir Dam, located in Harris County, Texas, is a crucial water resource infrastructure managed by the local government.


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Summary

Constructed in 1976 by BROWN AND ROOT INC, this earth dam stands at a height of 35 feet and has a length of 15,315 feet. Serving as a barrier on the off-channel of the San Jacinto River, it provides a storage capacity of 5,188 acre-feet to meet the water demands of Lynchburg (Four Corners) and its surrounding areas.

The dam has a primary purpose of 'Other' and is regulated by the Texas Commission on Environmental Quality (TCEQ) with state jurisdiction and permitting. Despite having a high hazard potential, the dam's condition assessment is currently not rated, indicating a need for further evaluation. With a history of periodic inspections every 5 years, the dam's emergency action plan was last revised in August 2012 to ensure preparedness for any unforeseen events.

Despite the lack of a spillway, Lynchburg Reservoir Dam plays a vital role in water management and flood control, highlighting the importance of ongoing monitoring and maintenance to ensure its structural integrity and safety for the local community. With the risk level assessed as high, it is essential for authorities to implement risk management measures and update emergency protocols to mitigate potential hazards effectively.

Year Completed

1976

Dam Length

15315

Dam Height

35

River Or Stream

OFF CH-SAN JACINTO RIVER

Primary Dam Type

Earth

Surface Area

200

Hydraulic Height

35

Drainage Area

0.32

Nid Storage

5188

Structural Height

35

Outlet Gates

Slide (sluice gate) - 3

Hazard Potential

Not Available

Foundations

Soil

Nid Height

35
       
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.