Carrollton Water Treatment Dam Reservoir Report

Last Updated: January 12, 2026

Located in New Orleans, Louisiana, the Carrollton Water Treatment Dam, also known as the New Orleans Dam, stands as a vital piece of infrastructure for the city's water supply.


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Summary

Constructed in 1905, this earth dam sits along the TR-Mississippi River and serves as a crucial source for water storage with a capacity of 99 acre-feet. The dam's primary purpose is water supply, and it plays a significant role in ensuring a steady and reliable water source for the surrounding community.

With a hydraulic height of 9 feet and a length of 5130 feet, the Carrollton Water Treatment Dam boasts a controlled spillway type with a width of 12 feet. The dam's condition is assessed as satisfactory, with a significant hazard potential due to its location and purpose. Regular inspections are conducted to ensure its structural integrity and safety. The dam is under state regulation by the Louisiana Department of Transportation and Development, with state permitting, inspection, and enforcement in place to safeguard its operations and functionality.

For water resource and climate enthusiasts, the Carrollton Water Treatment Dam offers a fascinating glimpse into the intersection of water management, infrastructure, and environmental stewardship. As a crucial component of New Orleans' water supply system, this dam serves as a testament to the importance of sustainable water resource management and highlights the ongoing efforts to ensure the resilience and reliability of vital infrastructure in the face of changing climate patterns and water needs.

Year Completed

1905

Dam Length

5130

Dam Height

9

River Or Stream

TR-MISSISSIPPI RIVER

Primary Dam Type

Earth

Surface Area

11

Hydraulic Height

9

Drainage Area

0.15

Nid Storage

99

Structural Height

9

Outlet Gates

Vertical Lift

Hazard Potential

Significant

Foundations

Soil

Nid Height

9
       
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.