Long Pond Ironworks were founded in 1766 by Peter Hasenclever. Hasenclever brought 500 ironworkers and their families from Germany to build an ironworks "plantation". A dam at "Long Pond" (Greenwood Lake) provided the waterpower needed to operate a blast for the furnace and a large forge. The ironworks produced iron for the Continental Army, for the American forces in the War of 1812, and for the Union Army during the Civil War. Metalmaking stopped at the site in 1882 when the ironworks was bankrupted by newer facilities in Pittsburgh.