Seymour Reservoir #1 Dam Reservoir Report

Last Updated: December 5, 2025

Seymour Reservoir #1 Dam, located in Connecticut, stands as a testament to engineering excellence since its completion in 1898.


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Summary

This masonry dam serves as a vital water supply infrastructure, with a storage capacity of 49 acre-feet and a significant hazard potential. Situated on the HEMP SWAMP BR TRIB, the dam spans 340 feet in length and reaches a height of 26 feet, providing essential water resources to the surrounding region.

Managed by the State of Connecticut, the Seymour Reservoir #1 Dam is subject to regular inspections, with its condition assessed as fair during the last inspection in 2015. Despite its age, the dam continues to play a crucial role in water supply management, with a normal storage capacity of 49 acre-feet and a surface area of 5 acres. With its historical significance and ongoing importance in water resource management, the Seymour Reservoir #1 Dam stands as a symbol of sustainable infrastructure in the face of climate challenges.

As climate change continues to impact water resources globally, the Seymour Reservoir #1 Dam remains a key player in ensuring water security for the community it serves. With a spillway width of 23 feet and a maximum discharge capacity of 105 cubic feet per second, the dam is equipped to handle potential flood events. As efforts to enhance climate resilience and water management grow increasingly critical, the Seymour Reservoir #1 Dam stands as a critical piece of infrastructure in safeguarding water resources for future generations.

Year Completed

1898

Dam Length

340

Dam Height

26

River Or Stream

HEMP SWAMP BR TRIB

Primary Dam Type

Masonry

Surface Area

5

Drainage Area

1.45

Nid Storage

49

Hazard Potential

Significant

Nid Height

26
       
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.