Diverting Reservoir Dam Reservoir Report

Last Updated: December 5, 2025

The Diverting Reservoir Dam, located in Croton Falls, New York, was completed in 1911 and is owned by the local government.


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Summary

This earth dam stands at a height of 54 feet and has a length of 1190 feet, with a primary purpose of water supply. The reservoir has a storage capacity of 3675 acre-feet and serves as a crucial water resource for the surrounding area.

Managed by the New York State Department of Environmental Conservation, the Diverting Reservoir Dam is regulated, permitted, inspected, and enforced by state authorities. With a high hazard potential and a very high risk assessment rating, emergency action plans and risk management measures are in place to ensure the safety and security of the dam and surrounding communities. The dam's condition assessment in 2018 deemed it satisfactory, but regular inspections and maintenance are crucial to mitigate any potential risks.

The East Branch Croton River is the source of water for the Diverting Reservoir Dam, and its controlled spillway has a width of 1000 feet to manage excess water flow. The dam's location in Putnam County, New York, underscores its importance in providing water supply and flood control for the region. Climate and water resource enthusiasts would find the engineering and management of this dam a fascinating case study in sustainable water resource management in the face of changing climate patterns.

Year Completed

1911

Dam Length

1190

Dam Height

54

River Or Stream

EAST BRANCH CROTON RIVER

Primary Dam Type

Earth

Surface Area

154

Drainage Area

88

Nid Storage

3675

Hazard Potential

High

Nid Height

54
       
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.