Larry Mayo Dam Reservoir Report

Last Updated: December 5, 2025

Larry Mayo Dam, located in Anderson, Texas, is a private dam with a primary purpose classified as 'Other'.


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Summary

The dam, constructed from earth materials with a buttress core type, stands at a height of 12.3 feet and has a length of 400 feet. It has a storage capacity of 68 acre-feet, with a normal storage level of 52 acre-feet. The dam features an uncontrolled spillway with a width of 72 feet and two uncontrolled outlet gates.

Despite being privately owned, Larry Mayo Dam is subject to state permitting and inspection requirements. It falls under the jurisdiction of the Texas state regulatory agency and has been inspected every five years, with the last inspection conducted in August 2010. The dam has a moderate risk assessment rating of 3, indicating a potential for hazards that require management measures. Overall, Larry Mayo Dam plays a crucial role in water resource management in the area, highlighting the intersection of water infrastructure and climate considerations.

Dam Length

400

Dam Height

12.3

River Or Stream

Primary Dam Type

Earth

Surface Area

13.8

Nid Storage

68

Outlet Gates

Uncontrolled - 2

Hazard Potential

Not Available

Foundations

Unlisted/Unknown

Nid Height

12
       
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.