Tomsey Pond Dam Reservoir Report

Last Updated: December 5, 2025

Tomsey Pond Dam, located in Ketchumville, New York, is a privately owned earth dam built in 1955 for recreational purposes.


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Summary

With a height of 18 feet and a length of 340 feet, the dam has a storage capacity of 51 acre-feet, serving as a popular spot for outdoor activities in the area. The dam is situated on the Ketchumville Branch of the Nanticoke River, with a low hazard potential but a high risk assessment rating of 2.

Despite being last inspected in 1993, the dam is regulated by the New York State Department of Environmental Conservation (NYS DEC) and meets state permitting, inspection, and enforcement requirements. While the dam does not have a spillway, it is equipped with outlet gates and has a maximum discharge capacity of 174 cubic feet per second. The surrounding area has a drainage area of 0.25 square miles and a surface area of 9 acres, making it an important water resource for the community.

Water resource and climate enthusiasts can appreciate Tomsey Pond Dam for its role in providing recreational opportunities and water storage in Tioga County, New York. As a state-regulated structure with a high-risk assessment, the dam serves as a reminder of the importance of proper maintenance and monitoring to ensure the safety and sustainability of water infrastructure in the region. With its picturesque location and historical significance, Tomsey Pond Dam is a valuable asset for both local residents and visitors seeking to enjoy the natural beauty and outdoor amenities it offers.

Year Completed

1955

Dam Length

340

Dam Height

18

River Or Stream

KETCHUMVILLE BR NANTICOKE

Primary Dam Type

Earth

Surface Area

9

Drainage Area

0.25

Nid Storage

51

Hazard Potential

Low

Nid Height

18
       
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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.