Lake Boyce Dam

About Lake Boyce Dam

The primary purpose of Lake Boyce Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Boy Scouts Of America Greater Hudson Valley Council (private). It impounds the Tr-hudson River near Thomkins Cove.

The dam stands 16 feet tall and stretches 275 feet across, creates a reservoir covering 16 acres, has a maximum storage capacity of 85 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1929, the structure is well-established, with more than 75 years of service.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 05/07/2025.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The New York dam safety program can provide more specific information about emergency planning for this structure.

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