Bayou De Siard Dam Reservoir Report

Last Updated: December 11, 2025

Bayou De Siard Dam, located in Monroe, Louisiana, was completed in 1933 and serves as a vital structure for flood risk reduction and water supply purposes.


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Summary

This earth dam stands at a height of 42 feet and has a hydraulic height of 35 feet, with a length of 450 feet and a storage capacity of 10,500 acre-feet. The dam is regulated by the Louisiana Department of Transportation and Development and is inspected every three years, with its condition assessed as fair during the last inspection in 2018.

With its significant hazard potential and moderate risk assessment rating, Bayou De Siard Dam plays a crucial role in protecting the surrounding area from flooding events. The dam features a vertical lift outlet gate and an uncontrolled spillway type, ensuring effective water management during high flow periods. Despite its fair condition assessment, the dam remains a critical infrastructure for the local government, providing essential flood protection and water storage capabilities for the community. Enthusiasts of water resources and climate will find Bayou De Siard Dam to be an intriguing example of engineering ingenuity in managing water resources in Louisiana.

Year Completed

1933

Dam Length

450

Dam Height

42

River Or Stream

BAYOU DE SIARD

Primary Dam Type

Earth

Surface Area

1215

Hydraulic Height

35

Drainage Area

10

Nid Storage

10500

Structural Height

42

Outlet Gates

Vertical Lift

Hazard Potential

Significant

Foundations

Soil

Nid Height

42
       
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.