Aldon Mill Pond Dam Reservoir Report

Last Updated: December 6, 2025

Aldon Mill Pond Dam, also known as Tankerhoosen Pond, is a picturesque masonry dam located in Talcotville, Connecticut.


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Summary

Built in 1920, this dam serves primarily for recreational purposes and stands at 25 feet high with a length of 95 feet. With a storage capacity of 87 acre-feet and a drainage area of 12.6 square miles, it contributes to the beauty and ecosystem of the Tankerhoosen River.

Despite its historic significance and recreational value, Aldon Mill Pond Dam has been flagged with a significant hazard potential and poor condition assessment. The last inspection in 2015 revealed areas of concern, prompting the need for further evaluation and potential maintenance or rehabilitation. The dam's spillway, an uncontrolled type with a width of 72 feet, poses potential risks that must be addressed to ensure the safety of surrounding communities and the environment.

As enthusiasts of water resources and climate, it is crucial to monitor and address the condition of Aldon Mill Pond Dam to mitigate potential hazards and preserve its role in recreation and water management. With a moderate risk assessment rating and a history dating back to the early 20th century, this dam serves as a reminder of the delicate balance between human development and environmental stewardship in our changing climate.

Year Completed

1920

Dam Length

95

Dam Height

25

River Or Stream

TANKERHOOSEN RIVER

Primary Dam Type

Masonry

Surface Area

7

Drainage Area

12.6

Nid Storage

87

Hazard Potential

Significant

Nid Height

25
       
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.