Rocky River Main Dam Reservoir Report

Last Updated: December 5, 2025

Rocky River Main Dam, also known as Candlewood Lake Dam, is a crucial structure located in New Milford, Connecticut, serving as a public utility for hydroelectric power generation and recreation purposes.


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Summary

Completed in 1929, this dam stands at 107 feet high and spans 952 feet in length, with a storage capacity of 172,000 acre-feet and a surface area of 5,600 acres. Situated on the Rocky River, it is under the jurisdiction of the Federal Energy Regulatory Commission (FERC) and is not regulated by the state.

The dam's high hazard potential and risk assessment rating of 2 emphasize the importance of regular inspections and emergency preparedness. With a history of no recorded condition assessments, the dam remains in an unknown state of maintenance. Despite lacking a spillway, the dam's design and operational safety measures are overseen by FERC, ensuring compliance with federal regulations. The presence of six associated structures further highlights the significance of the Rocky River Main Dam in managing water resources and mitigating potential risks to downstream areas.

For water resource and climate enthusiasts, the Rocky River Main Dam offers a fascinating glimpse into the intersection of infrastructure, energy production, and environmental stewardship. Its role in harnessing hydropower while providing recreational opportunities underscores the complex balance between human needs and ecological considerations. As discussions around dam safety and resilience continue to evolve, the Rocky River Main Dam stands as a testament to the ongoing challenges and innovations shaping water management practices in the 21st century.

Year Completed

1929

Dam Length

952

Dam Height

107

River Or Stream

Rocky River

Primary Dam Type

Other

Surface Area

5600

Drainage Area

40.4

Nid Storage

172000

Hazard Potential

High

Nid Height

107
       
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.