This is an unmarked entrance to the trails on land owned by the Institute of Advanced Study. These trails are private property, and the public is allowed accss, for hiking, cross country skiing, etc., but no wheeled vehicles are allowed -- to be clear no bicycles allowed.
The New Jersey Trails Association describes these trails and has a map. It also describes the crossing at Stony Brook as "stepping stones", i.e., there is no bridge. Bird watchers like the area included in this trail system, which is described as "one of the prime areas for migratory birds in the immediate area".
The entrance is about 1/2 mile south of Alexander Road.
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