Fountain Lake Dam Reservoir Report

Last Updated: December 5, 2025

Fountain Lake Dam, located in Seymour, Connecticut, is a concrete structure completed in 1888 with a primary purpose of recreation.


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Summary

The dam stands at a height of 15 feet and has a length of 300 feet, creating a reservoir with a storage capacity of 72 acre-feet. The dam is situated on a Naugatuck River tributary and is regulated by the Connecticut Department of Energy and Environmental Protection.

Despite being rated with a high hazard potential, the condition assessment of Fountain Lake Dam is marked as fair, with the last inspection conducted in May 2018. The dam has an uncontrolled spillway and features valve outlet gates. While it has a moderate risk assessment, no specific risk management measures or emergency action plans were highlighted in the data. The dam's location in the New Haven County offers a unique recreational spot for water resource and climate enthusiasts to explore and appreciate the intersection of human infrastructure with natural landscapes in the region.

Year Completed

1888

Dam Length

300

Dam Height

15

River Or Stream

NAUGATUCK RIVER TRIBUTARY

Primary Dam Type

Concrete

Surface Area

5.5

Drainage Area

0.17

Nid Storage

72

Outlet Gates

Valve

Hazard Potential

High

Nid Height

15
       
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.