Beaver Dam Lake is a census-designated place (CDP) in the towns of New Windsor, Blooming Grove, and Cornwall in Orange County, New York, United States.

[3] The CDP is in eastern Orange County, bordered to the west by the village of Washingtonville and to the south by Salisbury Mills.

The community surrounds Beaverdam Lake, which drains south to Moodna Creek at Salisbury Mills.

Moodna Creek flows into the Hudson River between New Windsor and Cornwall-on-Hudson.

New York State Route 94 forms the southern edge of the CDP.