Waterloo Reservoir Report

Last Updated: December 6, 2025

Waterloo, also known as Seneca Lake Dam, is a significant hydroelectric structure located in Seneca, New York.


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Summary

Completed in 1915, this concrete dam stands at a height of 16.5 feet and has a normal storage capacity of 477,600 acre-feet. It serves the primary purposes of hydroelectric power generation and navigation on the Seneca Canal, showcasing its importance in the region's water resource management.

Managed by the Federal Energy Regulatory Commission, Waterloo has a controlled spillway with a width of 138 feet and is equipped with various outlet gates for operational control. With a high hazard potential and very high risk assessment rating, the dam undergoes regular inspections to ensure its structural integrity and safety. While its condition assessment is currently not available, the dam's emergency action plan was last revised in 2018, emphasizing the importance of preparedness and risk management in the face of potential emergencies.

Situated within the Baltimore District, Waterloo plays a crucial role in supporting the local ecosystem and economy through its hydroelectric capabilities. As a key feature in the Seneca Canal, it continues to be a vital resource for water and climate enthusiasts interested in understanding the intersection of infrastructure development, environmental stewardship, and sustainable energy practices in the region.

Year Completed

1915

Dam Length

306

Dam Height

16.5

River Or Stream

Seneca Canal

Primary Dam Type

Concrete

Surface Area

43200

Drainage Area

746

Nid Storage

477600

Outlet Gates

Other Controlled - 1, Tainter (radial) - 4

Hazard Potential

High

Foundations

Rock

Nid Height

17
       
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.