Mercer Lake, also known as Lake Mercer, is a man-made lake within Mercer County Park in West Windsor, Mercer County, New Jersey, United States.
The lake came into being with the 1975 construction of a dam to control flooding on the Assunpink Creek in nearby Trenton by the United States Department of Agriculture Soil Conservation Service (now the Natural Resources Conservation Service). The basin, now occupied by the lake, was excavated by crews building nearby Interstate 295 at no additional cost to taxpayers.
