Philadelphia - Nonoverflow Section Reservoir Report
Nearby: Indian Falls Antwerp Village Dam
Last Updated: December 17, 2025
Philadelphia - Nonoverflow Section is a private-owned structure situated in Jefferson, New York, along the Indian River.
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Summary
This hydroelectric dam, completed in 1910, stands at a height of 13 feet and has a storage capacity of 89 acre-feet. With a low hazard potential, the dam serves the primary purpose of generating hydroelectric power, contributing to the region's renewable energy resources.
Managed by the Federal Energy Regulatory Commission, Philadelphia - Nonoverflow Section plays a vital role in water resource management and climate resilience. Despite its age, the dam has not undergone recent condition assessments, but its risk assessment indicates a high level of risk, emphasizing the importance of regular inspections and maintenance to ensure its continued safe operation. While not regulated by the state, the dam falls under federal oversight, highlighting the interplay between different levels of government in safeguarding critical infrastructure.
As an integral part of the water infrastructure in the region, Philadelphia - Nonoverflow Section underscores the need for proactive risk management measures and emergency preparedness. With its gravity dam type and concrete construction, the structure stands as a testament to early 20th-century engineering. By staying abreast of evolving climate challenges and investing in the upkeep of such vital assets, communities can better adapt to changing environmental conditions and ensure a sustainable water supply for future generations.
Year Completed |
1910 |
Dam Length |
45 |
Dam Height |
13 |
River Or Stream |
Indian River |
Primary Dam Type |
Gravity |
Surface Area |
108 |
Drainage Area |
229 |
Nid Storage |
89 |
Hazard Potential |
Low |
Foundations |
Rock |
Nid Height |
13 |
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.
Philadelphia - Nonoverflow Section
To Boat Launch Theresa