Lanman Gss No 1 Reservoir Report

Last Updated: December 5, 2025

Lanman Gss No 1 is a privately owned earth dam located in Johnson County, Texas, designed by the USDA NRCS for fire protection, stock, and small fish pond purposes.


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Summary

Completed in 1981, the dam stands at a height of 21 feet with a length of 652 feet, providing a storage capacity of 68 acre-feet. Situated on the TR-S Fork Chambers Creek, the dam serves multiple functions including recreation and water resource management.

Despite its age, Lanman Gss No 1 has not been rated for its condition assessment and is listed as having a high risk potential. The dam features no spillway, locks, or significant drainage area, highlighting its vulnerability in times of high discharge. With no inspection frequency or emergency action plan in place, there is a need for increased monitoring and risk management measures to ensure the safety and integrity of the structure for both water resource and climate enthusiasts in the area.

As part of the Fort Worth District, Lanman Gss No 1 falls under state jurisdiction with permitting and inspection requirements in place. The dam's primary designer, the Natural Resources Conservation Service, remains responsible for its design and construction. With the potential for significant risk and the absence of critical safety measures, there is a pressing need for enhanced oversight and management to protect the surrounding community and water resources in the event of an emergency.

Year Completed

1981

Dam Length

652

Dam Height

21

River Or Stream

TR-S FORK CHAMBERS CREEK

Primary Dam Type

Earth

Hydraulic Height

21

Nid Storage

68

Structural Height

21

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

21
       
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.