Autumn Lake Dam Reservoir Report
Nearby: Cedar Lake Dam Lighthouse Hill
Last Updated: December 7, 2025
Autumn Lake Dam, also known as Fawn Lake, stands in Altmar, New York, along the TR-Beaverdam Brook.
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Summary
Constructed in 1971 by the USDA NRCS, this private recreation dam offers a serene surface area of 9.8 acres and a maximum storage capacity of 80 acre-feet, serving as a popular spot for outdoor enthusiasts. With a dam height of 28 feet and a length of 510 feet, the structure is primarily used for recreational purposes, attracting visitors to its tranquil waters for fishing, boating, and relaxation.
Managed by the NYS DEC, Autumn Lake Dam is inspected, permitted, and regulated by the state, ensuring its safety and compliance with environmental standards. Despite its low hazard potential, the dam poses a moderate risk due to its location and design, with a maximum discharge capacity of 138 cubic feet per second and an uncontrolled spillway width of 15 feet. The dam's condition is currently rated as "Not Rated," indicating the need for further assessment to ensure the continued safety of the structure and surrounding area.
Located in Oswego County, New York, Autumn Lake Dam is a picturesque destination for water resource and climate enthusiasts seeking a peaceful retreat in nature. With its tranquil surroundings and recreational opportunities, the dam serves as a vital resource for the community, providing a place for residents and visitors to connect with the natural beauty of the region. As efforts continue to monitor and maintain the dam's integrity, its role in supporting outdoor recreation and environmental conservation remains essential for the well-being of the local ecosystem and those who enjoy its scenic waters.
Year Completed |
1971 |
Dam Length |
510 |
Dam Height |
28 |
River Or Stream |
TR-BEAVERDAM BROOK |
Primary Dam Type |
Earth |
Surface Area |
9.8 |
Drainage Area |
0.29 |
Nid Storage |
80 |
Hazard Potential |
Low |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Salmon River At Pineville Ny
|
962cfs |
Scriba Creek Near Constantia Ny
|
40cfs |
Sandy Creek Near Adams Ny
|
245cfs |
East Branch Fish Creek At Taberg Ny
|
499cfs |
Oneida River Near Euclid Ny
|
5330cfs |
Oswego River At Lock 7
|
6120cfs |
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.
Autumn Lake Dam
Oswego County Fairgrounds
Selkirk Shores State Park
WE Merrill Park