Lake Sebago

At 310 acres , Lake Sebago is the largest lake in Harriman State Park in the U.S. state of New York. The name is Algonquian for "big water". Operated by the Palisades Interstate Park Commission, Lake Sebago is surrounded by picnic lawns and play fields, and is popular with anglers fishing for bass, perch and sunfish. The lake has a former swimming beach, hand boat launch and cabin camping. Lake Sebago lies near Sloatsburg. It is located just south of Lake Kanawauke and is accessible by auto from Seven Lakes Drive. New Sebago Beach, a beach that resided on the shore of the lake, opened in the 1940s but closed in 2011 due to being damaged by Hurricane Irene, and the picnic areas closed in 2014 due to Hurricane Sandy. New Sebago Beach has since been closed and abandoned, as well as the beach's parking lot and access road.

The lake was created in 1925 by the Palisades Interstate Park Commission under William A. Welch by building a dam across Stony Brook. The lake filled the former site of Johnsontown—a pre-revolutionary logging settlement founded in the mid-1700s in the Stony Brook valley. By the early 1900s, Johnsontown was the largest mountain settlement in the western part of the Ramapos.

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