Dexter South Channel Dam Reservoir Report
Last Updated: December 19, 2025
The Dexter South Channel Dam, also known as Dam No.
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Summary
18, is a private hydroelectric concrete dam located in Dexter, New York on the Black River. Completed in 1925, this multi-arch dam stands at a height of 20 feet and has a structural height of 22 feet, with a length of 433 feet. With a storage capacity of 1200 acre-feet and a maximum discharge of 50,000 cubic feet per second, the dam serves as an important structure for regulating water flow and generating hydroelectric power in the region.
Managed by the Federal Energy Regulatory Commission (FERC), the Dexter South Channel Dam has a low hazard potential and a moderate risk assessment rating. While it is not state-regulated or permitted, the dam undergoes regular inspections with the last one conducted in February 2016. The dam features an uncontrolled spillway with a width of 433 feet, and its primary purpose remains hydroelectric power generation. With its strategic location and historical significance, the Dexter South Channel Dam continues to play a vital role in water resource management and climate resilience efforts in the area.
Overall, the Dexter South Channel Dam stands as a testament to early 20th-century engineering and its lasting impact on water infrastructure development. As a private hydroelectric facility in New York, this concrete gravity dam not only contributes to renewable energy production but also helps in flood control and water management along the Black River. With its steady storage capacity, controlled discharge capabilities, and FERC oversight, the dam remains a key player in the region's water resource landscape, showcasing the intersection of historical preservation, modern energy needs, and climate adaptation strategies.
Year Completed |
1925 |
Dam Length |
433 |
Dam Height |
20 |
River Or Stream |
Black River |
Primary Dam Type |
Concrete |
Surface Area |
120 |
Drainage Area |
1900 |
Nid Storage |
1200 |
Structural Height |
22 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Black River At Watertown Ny
|
2580cfs |
Sandy Creek Near Adams Ny
|
212cfs |
Beaver River At Croghan Ny
|
684cfs |
Salmon River At Pineville Ny
|
500cfs |
West Branch Oswegatchie R Nr Harrisville Ny
|
322cfs |
Independence River At Donnattsburg Ny
|
214cfs |
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.
Dexter South Channel Dam
Conservation Department Road Jefferson County