South Channel Reservoir Report

Last Updated: December 5, 2025

Located in Watertown, New York, the South Channel, also known as the Diversion Dam, is a hydroelectric structure owned by the local government.


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Summary

Completed in 1924, this concrete gravity dam serves multiple purposes including hydroelectric power generation and water supply. With a height of 12 feet and a length of 810 feet, the dam has a storage capacity of 2000 acre-feet and covers a surface area of 190 acres.

Managed by the Federal Energy Regulatory Commission, the South Channel dam plays a vital role in harnessing the power of the Black River to generate electricity while also ensuring a stable water supply for the surrounding area. Despite its low hazard potential, the dam undergoes regular inspections to maintain its structural integrity and operational efficiency. The risk assessment for the dam is rated as moderate, highlighting the importance of ongoing risk management and emergency preparedness measures.

As a key component of the local water infrastructure, the South Channel dam represents a unique blend of historical significance and modern functionality. Its presence not only contributes to the regional water resource management efforts but also underscores the intersection of environmental conservation and sustainable energy production in the context of climate change adaptation.

Year Completed

1924

Dam Length

810

Dam Height

12

River Or Stream

Black River

Primary Dam Type

Concrete

Surface Area

190

Drainage Area

1874

Nid Storage

2000

Hazard Potential

Low

Foundations

Rock

Nid Height

12
       
Seasonal Comparison

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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.