Hailsboro Mill #3 Dam Reservoir Report
Last Updated: December 18, 2025
Hailsboro Mill #3 Dam, located in Gouverneur, New York, along the Oswegatchie River, is a privately owned structure with a primary purpose of hydroelectric power generation.
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Summary
Built in 1910, this buttress dam stands at a height of 16 feet and has a length of 68 feet, providing a storage capacity of 35 acre-feet. With a maximum discharge capacity of 800 cubic feet per second and a controlled spillway width of 17 feet, the dam plays a crucial role in managing water flow in the region.
Although the dam has not been rated for its current condition, it is classified as having a significant hazard potential with a very high risk assessment. The New York State Department of Environmental Conservation (NYS DEC) oversees the regulation, permitting, inspection, and enforcement of this dam. Despite not having a designated emergency action plan (EAP) or inundation maps prepared, the dam has undergone inspections every 4 years, with the last inspection taking place in July 2008. As water resource and climate enthusiasts, monitoring and ensuring the safety and maintenance of structures like Hailsboro Mill #3 Dam is crucial for sustainable water management and climate resilience in the region.
Year Completed |
1910 |
Dam Length |
68 |
Dam Height |
16 |
River Or Stream |
OSWEGATCHIE RIVER |
Primary Dam Type |
Buttress |
Surface Area |
7 |
Drainage Area |
0.03 |
Nid Storage |
35 |
Hazard Potential |
Significant |
Nid Height |
16 |
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.
Hailsboro Mill #3 Dam
Johnstown Street Gouverneur