Larchmont Dam Reservoir Report

Last Updated: December 6, 2025

Larchmont Dam, located in Larchmont, New York, was completed in 1925 and has a significant historical and environmental impact on the area.


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Summary

This masonry dam on the Sheldrake River serves as a vital structure for flood control and water storage, with a storage capacity of 37 acre-feet and a spillway width of 50 feet. The dam is owned by the local government and is regulated by the New York State Department of Environmental Conservation.

Despite its age, Larchmont Dam has faced challenges in recent years, with a poor condition assessment and a significant hazard potential. The dam's last inspection in 2020 revealed the need for improvements and maintenance to ensure its continued functionality and safety. The risk assessment for the dam is moderate, highlighting the importance of ongoing monitoring and management to mitigate potential risks to the surrounding community and environment.

As a key infrastructure for water resource management in the region, Larchmont Dam plays a crucial role in maintaining the balance of water levels and preventing flooding. Climate enthusiasts and water resource advocates are closely monitoring the dam's condition and advocating for necessary upgrades to enhance its resilience in the face of changing weather patterns and increasing risks of extreme events. The dam's significance in the local ecosystem and its potential impact on climate adaptation strategies make it a focal point for discussions on sustainable water management practices in the region.

Year Completed

1925

Dam Length

210

Dam Height

10

River Or Stream

SHELDRAKE RIVER

Primary Dam Type

Masonry

Surface Area

5

Nid Storage

37

Hazard Potential

Significant

Nid Height

10
       
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.