Long Branch Dam Reservoir Report

Last Updated: December 7, 2025

Long Branch Dam, also known as Long Branch Lake, is a Federal-owned structure located in Macon, Missouri.


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Summary

Completed in 1976, this Earth-type dam serves multiple purposes, including flood risk reduction, recreation, and water supply. With a structural height of 80 feet and a hydraulic height of 71 feet, Long Branch Dam has a storage capacity of 98,000 acre-feet and covers a surface area of 2,430 acres.

Managed by the US Army Corps of Engineers, Long Branch Dam poses a high hazard potential and has a moderate risk assessment rating. The dam's emergency action plan is regularly updated and meets guidelines to mitigate potential risks. The USACE actively monitors the dam's condition, conducts maintenance and repairs as needed, and collaborates with local emergency managers to ensure public safety in case of a dam-related emergency.

Despite the risks associated with dam releases during severe weather events, the USACE continues to implement risk management measures to address all types of flood risk and ensure the structural integrity of Long Branch Dam. As water resource and climate enthusiasts, staying informed about the dam's operations and emergency preparedness efforts can help contribute to a safer and more resilient community in the face of potential water-related challenges.

Year Completed

1976

Dam Length

3800

River Or Stream

EAST FORK LITTLE CHARITON

Primary Dam Type

Earth

Surface Area

2430

Hydraulic Height

71

Drainage Area

109

Nid Storage

98000

Structural Height

80

Outlet Gates

Uncontrolled - 0

Hazard Potential

High

Foundations

Soil

Nid Height

80
       
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.