Sylvan Lake is ahamlet located in the Town ofBeekman, Dutchess County, New York, United States. It is named afterthe lake it sits on, which was formed during theIce Age.[citation needed]
The early Indians originally named it "poughquag", which means "round body of water". A smaller lake known as Hidden Lake is where Daniel Delany, in the late 19th century, discoverediron ore and made his fortune. He eventually bought the adjacent property which was the entire shoreline of Sylvan Lake and rebuiltSt. Denis Church for the town. Some iron ore mining also took place along the shores of Sylvan Lake in the early 1930s and some of these retainer wall pilings are still standing and can be clearly seen from a boat. When the mine was filled with water, construction equipment and mining tools were left on the bottom, and are present today.[citation needed]
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| Footnotes | ‡This populated place also has portions in an adjacent county or counties | |
41°36′27″N73°44′04″W / 41.60750°N 73.73444°W /41.60750; -73.73444