Greenwood Lake. Greenwood Lake is an interstate lake approximately seven miles long, straddling the border of New York and New Jersey.
It is located in the Town of Warwick and the Village of Greenwood Lake, New York and West Milford, New Jersey. It is the source of the Wanaque River.
The lake was originally called Quampium by the Munsee Native Americans who lived there. It was renamed Long Pond by Europeans, who settled the area in the 18th century for farming and ironmaking, and eventually came to be re-christened Greenwood Lake.
It was dammed up ca. 1765 by Peter Hasenclever of The American Company to increase the size of the lake for water power used downstream at the Long Pond Ironworks. The original dam was located even with today's Fox Island, with most of the lake extending north of the state line.
In 1837, the lake was again dammed, but at the location of the current dam, this time by the Morris Canal & Banking Company to supply water to the Pompton Feeder of the Morris Canal. The enlarged lake now flooded the Succor Brook at the northern end, forming the East Arm, surrounded Lime Ridge to create Chapel Island, and flooded the extreme southern end, including parts of Belcher Creek. The enlarged lake began to attract tourists. The Montclair and Greenwood Lake Railway reached the lake at Awosting around 1874, and the State Line depot was established around 1876. During its resort era, se