Arthurs Pond Dam Reservoir Report

Last Updated: December 6, 2025

Arthurs Pond Dam, located in Cornwall, New York, is a masonry dam with a height of 27 feet and a length of 248 feet.


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Summary

Built in 1920, the dam serves primarily for water supply purposes, holding a storage capacity of 259 acre-feet. Situated on Moodna Creek, the dam is state-regulated by the New York State Department of Environmental Conservation, with inspections conducted regularly to ensure its structural integrity.

With a surface area of 13 acres and a drainage area of 0.22 square miles, Arthurs Pond Dam poses a high hazard potential but is currently assessed as satisfactory in condition as of October 2017. Despite its moderate risk level, the dam has a controlled spillway with a width of 14 feet, providing an essential safety feature in cases of excess water flow. The dam's location and design play a crucial role in maintaining water resources for the surrounding area while also mitigating flood risks along Moodna Creek.

Owned by the local government, Arthurs Pond Dam stands as a vital infrastructure for water resource management in Orange County, New York. As climate change continues to impact water availability and flood risks, the dam serves as a critical asset in ensuring the region's water supply while also addressing potential environmental challenges. The dam's history, design, and regulatory oversight contribute to its significance in balancing water resource needs and climate resiliency efforts in the area.

Year Completed

1920

Dam Length

248

Dam Height

27

River Or Stream

MOODNA CREEK

Primary Dam Type

Masonry

Surface Area

13

Drainage Area

0.22

Nid Storage

259

Hazard Potential

High

Nid Height

27
       
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.