Chasm Falls Power Dam Reservoir Report
Nearby: Mountain View Lake Dam Twin Ponds Dam
Last Updated: December 16, 2025
Located in Chasm Falls, New York, the Chasm Falls Power Dam stands as a testament to early 20th-century engineering prowess.
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Summary
Completed in 1913, this concrete gravity dam harnesses the power of the Salmon River for hydroelectric purposes. With a height of 25 feet and a length of 202 feet, the dam boasts a storage capacity of 392 acre-feet and a maximum discharge of 3,290 cubic feet per second.
Managed by a private entity, the Chasm Falls Power Dam is not state-regulated but undergoes periodic inspections by the Federal Energy Regulatory Commission. Despite being rated as having a significant hazard potential, its condition remains unrated. The dam's spillway, measuring 95 feet in width, ensures the controlled release of excess water to prevent overflow and structural damage. Given its historical significance and continued operational reliability, the Chasm Falls Power Dam remains a vital component of the region's water resource infrastructure.
Year Completed |
1913 |
Dam Length |
202 |
Dam Height |
25 |
River Or Stream |
SALMON RIVER |
Primary Dam Type |
Concrete |
Surface Area |
35 |
Drainage Area |
126 |
Nid Storage |
392 |
Outlet Gates |
Slide (sluice gate) - 2 |
Hazard Potential |
Significant |
Foundations |
Rock |
Nid Height |
25 |
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.
Chasm Falls Power Dam