Port Jervis Reservoir #1 Dam Reservoir Report

Last Updated: December 7, 2025

Situated in Port Jervis, New York, the Port Jervis Reservoir #1 Dam stands as a vital component of the local water supply infrastructure.


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Summary

Completed in 1869, this earth dam boasts a height of 20 feet and a length of 230 feet, with a storage capacity of 550 acre-feet. Serving the primary purpose of water supply, it holds a normal storage level of 198 acre-feet and covers a surface area of 20 acres, drawing from a drainage area of 1.73 square miles along the TR-Neversink River.

Maintained by the New York State Department of Environmental Conservation, the dam is regulated, inspected, and enforced by state authorities to ensure its structural integrity and operational safety. With a high hazard potential, the dam is categorized as being in fair condition, with a moderate risk assessment. Equipped with an uncontrolled spillway and a spillway width of 36 feet, the dam is designed to manage potential floods and safeguard the surrounding area. Despite its age, the dam continues to play a crucial role in securing a reliable water supply for the community.

As a historic structure with a significant impact on water resource management in the region, the Port Jervis Reservoir #1 Dam remains a testament to the enduring importance of infrastructure in sustaining local environments and communities. With regular inspections and maintenance, this earth dam continues to serve as a key asset in ensuring water security and mitigating potential risks associated with its operation. For water resource and climate enthusiasts, the dam represents a tangible link between past engineering achievements and present-day efforts to adapt to changing environmental conditions.

Year Completed

1869

Dam Length

230

Dam Height

20

River Or Stream

TR-NEVERSINK RIVER

Primary Dam Type

Earth

Surface Area

20

Drainage Area

1.73

Nid Storage

550

Hazard Potential

High

Nid Height

20
       
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.