Little Alamo Lake Dam Reservoir Report

Last Updated: December 5, 2025

Little Alamo Lake Dam, located in La Salle, Texas, was completed in 1964 and stands at a height of 16 feet, with a length of 1025 feet.


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Summary

The dam serves primarily as a water supply structure, with a storage capacity of 448 acre-feet and a normal storage level of 128 acre-feet. This earth dam with a buttress core type sits on the TR-Green Branch river and is owned and operated by a private entity.

Despite its relatively small size, Little Alamo Lake Dam poses a high risk due to its condition being not rated and the absence of a spillway. The dam has not been inspected in recent years, and no emergency action plan is in place. The hazard potential of the dam is not available, and there is limited data on the risk management measures in place. Despite these challenges, the dam continues to play a crucial role in providing water supply to the surrounding area.

In the face of climate change and increasing water resource challenges, the maintenance and regulation of dams like Little Alamo Lake Dam become ever more critical. With the risk assessment indicating a high risk level, it is essential for the private owner to prioritize regular inspections, maintenance, and emergency preparedness to ensure the safety and reliability of this vital water infrastructure.

Year Completed

1964

Dam Length

1025

Dam Height

16

River Or Stream

TR-GREEN BRANCH

Primary Dam Type

Earth

Surface Area

29

Hydraulic Height

16

Nid Storage

448

Structural Height

16

Outlet Gates

None - 1

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

16
       
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.