Black River Reservoir Report
Nearby: Kamargo Watertown Dosing Station Dam
Last Updated: December 18, 2025
The Black River in Jefferson, New York, is home to a captivating concrete dam that has been generating hydroelectric power since 1919.
°F
°F
mph
Wind
%
Humidity
Summary
With a height of 25 feet and a length of 457.5 feet, this structure plays a crucial role in harnessing the river's power to provide renewable energy. Managed by the Federal Energy Regulatory Commission, the Black River dam stands as a testament to the innovative use of water resources for sustainable energy production.
Despite its age, the Black River dam is considered to have low hazard potential and moderate risk, with a maximum discharge of 33,000 cubic feet per second. The dam's spillway type is uncontrolled, with a width of 291 feet, ensuring the safe release of excess water during peak flow periods. While the condition assessment of the dam is not available, regular inspections by the Federal Energy Regulatory Commission help to maintain its structural integrity and ensure proper operation.
As a private-owned structure, the Black River dam serves as a reminder of the importance of responsible water resource management and the potential for hydroelectric power to contribute to climate-friendly energy solutions. With its historical significance and ongoing role in sustainable energy production, the Black River dam is a fascinating example of the intersection between water resources, climate action, and renewable energy generation.
Year Completed |
1919 |
Dam Length |
457.5 |
Dam Height |
25 |
River Or Stream |
Black River |
Primary Dam Type |
Concrete |
Surface Area |
25 |
Drainage Area |
1856 |
Nid Storage |
123 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Black River At Watertown Ny
|
2330cfs |
Sandy Creek Near Adams Ny
|
212cfs |
Beaver River At Croghan Ny
|
695cfs |
West Branch Oswegatchie R Nr Harrisville Ny
|
322cfs |
Independence River At Donnattsburg Ny
|
214cfs |
Salmon River At Pineville Ny
|
488cfs |
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.
Black River