Treadwell Mills Reservoir Report
Nearby: South Dam Main Mill Dam
Last Updated: December 19, 2025
Treadwell Mills is a privately owned hydroelectric dam located on the Saranac River in Plattsburgh, New York.
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Summary
Built in 1938, this gravity dam stands at 24 feet tall and spans 278 feet in length, with a maximum storage capacity of 820 acre-feet. The dam has a significant hazard potential and is under the jurisdiction of the Federal Energy Regulatory Commission (FERC), which oversees its operations and inspections.
With a drainage area of 604 square miles and a maximum discharge of 1200 cubic feet per second, Treadwell Mills plays a crucial role in water resource management and renewable energy production in the region. The dam features a controlled spillway and nine slide gates for water release, ensuring the safety and stability of the structure. Despite its age, the condition assessment of Treadwell Mills is currently unavailable, highlighting the need for regular monitoring and maintenance to mitigate any potential risks associated with the dam.
As a key player in the local water infrastructure, Treadwell Mills presents both opportunities and challenges for water resource and climate enthusiasts. Its historical significance, combined with its operational importance for hydroelectric power generation, underscores the need for sustainable management practices and proactive risk mitigation strategies to safeguard both the environment and the community. By staying informed and engaged with the regulatory oversight and maintenance efforts surrounding Treadwell Mills, enthusiasts can contribute to the preservation and responsible utilization of this vital water resource asset.
Year Completed |
1938 |
Dam Length |
278 |
Dam Height |
24 |
River Or Stream |
Saranac River |
Primary Dam Type |
Gravity |
Surface Area |
95 |
Drainage Area |
604 |
Nid Storage |
820 |
Outlet Gates |
Slide (sluice gate) - 9 |
Hazard Potential |
Significant |
Foundations |
Rock |
Nid Height |
24 |
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.
Area Campgrounds
| Location | Reservations | Toilets |
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Cumberland Bay State Park
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Primitive Campsite 13
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Primitive Campsite 14
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Primitive Campsite 16
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Primitive Campsite 15
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Primitive Campsite 20
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Treadwell Mills
Green Street 32, Plattsburgh