Cargill Falls Reservoir Report

Last Updated: December 5, 2025

Cargill Falls, also known as Putnam Falls, is a private hydroelectric dam located on the Quinebaug River in Putnam, Connecticut.


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Summary

Built in 1925, this concrete gravity dam stands at a height of 24 feet and has a length of 145 feet. It has a storage capacity of 65 acre-feet and serves the primary purpose of generating hydroelectric power. The dam is regulated by the Federal Energy Regulatory Commission and has a significant hazard potential.

The dam at Cargill Falls plays a vital role in water resource management and energy production in the region. Its controlled spillway and rock foundation ensure the safe operation of the structure, which is inspected regularly by federal authorities. The risk assessment for the dam is classified as very high, highlighting the importance of effective risk management measures and emergency preparedness. With a drainage area of 289 square miles, the dam contributes to the overall ecosystem health of the Quinebaug River watershed.

For water resource and climate enthusiasts, Cargill Falls represents a fascinating intersection of human engineering and natural systems. As a key player in the local hydroelectric infrastructure, the dam provides sustainable energy while also posing challenges in terms of risk and safety. Understanding the dynamics of this dam and its impact on the surrounding environment is crucial for ensuring the continued resilience and sustainability of water resources in the area.

Year Completed

1925

Dam Length

145

Dam Height

24

River Or Stream

Quinebaug River

Primary Dam Type

Concrete

Surface Area

13

Drainage Area

289

Nid Storage

65

Hazard Potential

Significant

Foundations

Rock

Nid Height

24
       
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.