Red Hook Mills Dam Reservoir Report

Last Updated: December 6, 2025

The Red Hook Mills Dam, located in Annandale-on-Hudson, New York, stands as a stone structure with a height of 26 feet and a length of 80 feet.


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Summary

This privately-owned dam on the Saw Kill river serves primarily for recreational purposes, offering a storage capacity of 104 acre-feet. Despite its historical significance and serene surroundings, the dam poses a significant hazard potential and has not been rated for its current condition.

Managed by the New York State Department of Environmental Conservation, the Red Hook Mills Dam has state-regulated permitting, inspection, and enforcement processes in place. With a spillway width of 40 feet and a maximum discharge capacity of 1000 cubic feet per second, the dam's risk assessment is classified as moderate. However, emergency action plans and inundation maps have not been updated or prepared in recent years, leaving room for improvement in risk management measures.

For water resource and climate enthusiasts, the Red Hook Mills Dam offers a glimpse into the intricate balance between human recreation, environmental protection, and public safety. As stakeholders work towards enhancing the dam's resilience and emergency preparedness, the dam continues to stand as a picturesque reminder of the intersection between man-made infrastructure and natural landscapes in the face of changing climatic conditions.

Dam Length

80

Dam Height

26

River Or Stream

SAW KILL

Primary Dam Type

Stone

Surface Area

12

Nid Storage

104

Hazard Potential

Significant

Nid Height

26
       
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.