G Snyder Wildlife Marsh Dam Reservoir Report

Last Updated: December 6, 2025

G Snyder Wildlife Marsh Dam, located in Ancram, Columbia County, New York, is a privately-owned earth dam constructed in 1960 with a primary purpose of wildlife management.


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Summary

This dam, also known as Snyder Wildlife Marsh, stands at a height of 7 feet and stretches for 700 feet, providing a storage capacity of 50 acre-feet and covering a surface area of 21 acres. The dam regulates the flow of the Roeliff Jansen Kill stream and has a low hazard potential with a moderate risk assessment rating.

Managed by the New York State Department of Environmental Conservation, the G Snyder Wildlife Marsh Dam is state-regulated, inspected, and permitted for operation. The dam features an uncontrolled spillway with a width of 12 feet and a maximum discharge capacity of 290 cubic feet per second, ensuring proper flood control measures for the surrounding area. Despite its age, the dam's condition assessment remains ungraded, indicating the need for further evaluation and maintenance to uphold its structural integrity and safety standards.

With the supervision of state regulatory agencies and a commitment to wildlife conservation, the G Snyder Wildlife Marsh Dam plays a crucial role in the ecosystem of the Roeliff Jansen Kill watershed. Water resource and climate enthusiasts can appreciate the significance of this dam in preserving the natural habitat and regulating water flow for the benefit of local flora and fauna. As efforts continue to assess and manage the dam's risk potential, it remains a key component in balancing ecological needs with human interventions in the region.

Year Completed

1960

Dam Length

700

Dam Height

7

River Or Stream

TR-ROELIFF JANSEN KILL

Primary Dam Type

Earth

Surface Area

21

Drainage Area

0.23

Nid Storage

50

Hazard Potential

Low

Nid Height

7
       
Seasonal Comparison

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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.