Soft Maple Diversion Reservoir Report
Last Updated: December 16, 2025
Soft Maple Diversion in Lewis, New York, is a privately-owned hydroelectric dam completed in 1926 with a primary purpose of generating hydroelectric power.
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Summary
This structure, located on the Beaver River, stands at 115 feet tall and has a storage capacity of 2,678 acre-feet. With a surface area of 400 acres and a drainage area of 240 square miles, the dam plays a crucial role in water resource management in the region.
Managed by the Federal Energy Regulatory Commission, Soft Maple Diversion has a high hazard potential and is subject to regular state inspections. Despite its age, the dam's condition assessment is currently listed as "Not Available," indicating a need for further evaluation. The dam's associated structures include eight additional components, ensuring efficient water diversion and storage in the area.
With its rich history and significant impact on the local ecosystem, Soft Maple Diversion serves as a key player in the region's water resource and climate landscape. As climate change continues to pose challenges to water management, this hydroelectric facility remains a vital asset in maintaining water supply and energy generation in Lewis, New York.
Year Completed |
1926 |
Dam Length |
910 |
Dam Height |
115 |
River Or Stream |
Beaver River |
Primary Dam Type |
Other |
Surface Area |
400 |
Drainage Area |
240 |
Nid Storage |
2678 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
115 |
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.
Soft Maple Diversion
Stillwater Reservoir Nr Beaver River Ny