Eel Weir Reservoir Report
Nearby: Ogdensburg Heuvelton
Last Updated: January 2, 2026
Eel Weir, a private hydroelectric dam located on the Oswegatchie River in Ogdensburg, New York, was completed in 1928 and stands at a height of 23 feet.
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Summary
With a normal storage capacity of 136 acre-feet and a maximum discharge of 62,000 cubic feet per second, this buttress dam serves primarily for hydroelectric purposes. The dam boasts a multi-arch core type and sits on a rock foundation, covering a length of 965 feet and spanning a surface area of 96 acres.
Managed by the Federal Energy Regulatory Commission, Eel Weir has a low hazard potential and undergoes inspections every three years. Despite a moderate risk assessment rating, the condition assessment for this dam is currently not available. The emergency action plan for Eel Weir was last revised in January 2021, ensuring that necessary measures are in place in the event of any unforeseen emergencies. With its historical significance and essential role in generating hydroelectric power, Eel Weir remains a vital component of the region's water resource infrastructure.
Year Completed |
1928 |
Dam Length |
965 |
Dam Height |
23 |
River Or Stream |
Oswegatchie River |
Primary Dam Type |
Buttress |
Surface Area |
96 |
Hydraulic Height |
16.5 |
Drainage Area |
1580 |
Nid Storage |
136 |
Structural Height |
21 |
Outlet Gates |
Slide (sluice gate) - 3 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
23 |
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.
Eel Weir
Maple City Trail Ogdensburg