Long Pond Dam Reservoir Report
Last Updated: December 6, 2025
Long Pond Dam, located in Oswego, New York, is a state-regulated structure built in 1937 on the TR-N Branch Little Salmon River.
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Summary
This earth dam stands at a height of 13.5 feet and has a length of 200 feet, providing a storage capacity of 790 acre-feet. The dam serves a primary purpose of "Other" and has a low hazard potential rating, with a moderate risk assessment.
Managed by the New York State Department of Environmental Conservation (NYS DEC), Long Pond Dam has not been rated for its condition as of the last inspection in 1901. Despite its age, the dam has a normal storage capacity of 340 acre-feet and a drainage area of 2.2 square miles. With a maximum discharge of 532 cubic feet per second and an uncontrolled spillway width of 32 feet, the dam plays a crucial role in water resource management in the region.
For water resource and climate enthusiasts, Long Pond Dam presents an intriguing case study of a historic structure that continues to play a vital role in the local ecosystem. As efforts to assess and manage the risks associated with the dam evolve, there is a growing need for ongoing inspection, maintenance, and potentially, upgrades to ensure the safety and sustainability of this crucial water management infrastructure.
Year Completed |
1937 |
Dam Length |
200 |
Dam Height |
13.5 |
River Or Stream |
TR-N BRANCH LITTLE SALMON |
Primary Dam Type |
Earth |
Surface Area |
114 |
Drainage Area |
2.2 |
Nid Storage |
790 |
Hazard Potential |
Low |
Nid Height |
14 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Salmon River At Pineville Ny
|
962cfs |
Scriba Creek Near Constantia Ny
|
40cfs |
East Branch Fish Creek At Taberg Ny
|
499cfs |
Oneida River Near Euclid Ny
|
5330cfs |
Ley Creek At Park Street
|
16cfs |
Sandy Creek Near Adams Ny
|
245cfs |
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.
Long Pond Dam