Weerheim Dam Reservoir Report

Last Updated: December 6, 2025

Located in West Oneonta, New York, Weerheim Dam, also known as Weerheim Lake, is a private recreational dam regulated by the New York State Department of Environmental Conservation (NYS DEC).


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Summary

Built in 1965, this earth dam stands at 16 feet high and stretches 560 feet in length, creating a reservoir with a storage capacity of 58 acre-feet. The dam is situated on TR-Harrison Creek and is managed for recreational purposes, offering visitors a serene setting for various outdoor activities.

With a low hazard potential and a moderate risk assessment rating of 3, Weerheim Dam has not been rated for its condition but is subject to regular state inspections and enforcement. The spillway, which is uncontrolled and 75 feet wide, can handle a maximum discharge of 58 cubic feet per second. Despite its age, the dam has not undergone any significant modifications, and its current risk management measures and emergency action plan status are not specified in the available data. Overall, Weerheim Dam remains a vital water resource for the local community, providing both recreational opportunities and environmental benefits in Otsego County, New York.

Year Completed

1965

Dam Length

560

Dam Height

16

River Or Stream

TR-HARRISON CREEK

Primary Dam Type

Earth

Surface Area

9

Drainage Area

0.08

Nid Storage

58

Hazard Potential

Low

Nid Height

16
       
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.