Rainbow Lake Dam Reservoir Report
Last Updated: December 20, 2025
Rainbow Lake Dam, located in Loon Lake, New York, stands as a testament to engineering and conservation efforts dating back to its completion in 1875.
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Summary
This earth dam, towering at a height of 9 feet and stretching 110 feet in length, serves primarily for recreational purposes, providing a serene and picturesque backdrop for visitors to enjoy the beauty of the North Branch Saranac River. With a storage capacity of 1920 acre-feet and a surface area of 356 acres, the dam offers a tranquil haven for water resource and climate enthusiasts seeking solace in nature.
Managed by the New York State Department of Environmental Conservation, Rainbow Lake Dam boasts a low hazard potential and is categorized as not rated in terms of condition assessment. Despite its age, the dam remains a reliable and essential structure, serving as a vital component in the local ecosystem. With its uncontrolled spillway and moderate risk assessment, the dam stands as a testament to the careful balance between human intervention and natural preservation, highlighting the importance of sustainable water resource management in the face of changing climate patterns.
As water resource and climate enthusiasts continue to monitor and protect vital structures like Rainbow Lake Dam, it serves as a shining example of the harmonious relationship between human development and environmental stewardship. With its historical significance, recreational value, and low hazard potential, Rainbow Lake Dam stands as a beacon of hope for future generations, reminding us of the importance of safeguarding our natural resources for years to come.
Year Completed |
1875 |
Dam Length |
110 |
Dam Height |
9 |
River Or Stream |
NORTH BRANCH SARANAC RIVER |
Primary Dam Type |
Earth |
Surface Area |
356 |
Drainage Area |
8 |
Nid Storage |
1920 |
Hazard Potential |
Low |
Nid Height |
9 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Rainbow Lake Dam