Tankerhoosen Lake North Dam Reservoir Report

Last Updated: December 6, 2025

Tankerhoosen Lake North Dam, located in Vernon, Connecticut, is a historic masonry dam completed in 1830 with a primary purpose of recreation.


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Summary

The dam stands at 16 feet tall and stretches 237 feet in length, creating a reservoir with a storage capacity of 99 acre-feet and a surface area of 16.5 acres. Situated on the Tankerhoosen River, this dam plays a crucial role in providing recreational opportunities for the surrounding community.

Despite its age, Tankerhoosen Lake North Dam is deemed to be in fair condition as of the last assessment in 2015, with a significant hazard potential. The dam is state-regulated and subject to regular inspections, with a mandated inspection frequency of five years. In case of emergencies, the dam lacks an updated Emergency Action Plan, raising concerns about its readiness in the face of potential risks. With its picturesque location and rich history, Tankerhoosen Lake North Dam remains a vital resource for water and climate enthusiasts seeking to explore the intersection of nature and human engineering.

Year Completed

1830

Dam Length

237

Dam Height

16

River Or Stream

TANKERHOOSEN RIVER

Primary Dam Type

Masonry

Surface Area

16.5

Drainage Area

10.95

Nid Storage

99

Hazard Potential

Significant

Nid Height

16
       
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.