North Lake C Dam Reservoir Report
Last Updated: December 14, 2025
North Lake C Dam, located in Atwell, Herkimer, New York, is a state-owned structure with a primary purpose of navigation.
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Summary
This earth dam, completed in 1850, stands at a height of 27 feet and stretches 190 feet in length. It has a storage capacity of 6,190 acre-feet, with a normal storage level of 5,480 acre-feet and a surface area of 442 acres. The dam, situated on the TR-Black River, is regulated by the NYS DEC and undergoes state inspection and enforcement.
Although classified as having a low hazard potential, North Lake C Dam is considered to have a high risk level (2). The condition of the dam is currently not rated, with the last inspection dating back to October 1995. Despite the lack of a current condition assessment, the dam continues to serve its purpose for navigation effectively. The dam does not feature a spillway, and there are no associated structures or outlet gates. It is a significant structure in the region, contributing to water resource management and climate considerations.
Year Completed |
1850 |
Dam Length |
190 |
Dam Height |
27 |
River Or Stream |
TR-BLACK RIVER |
Primary Dam Type |
Earth |
Surface Area |
442 |
Nid Storage |
6190 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
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Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
North Lake C Dam