 Construction of the Arden Brook Valley Road, which intended to connect Lake Cohasset and the brand new Upper Cohasset Lake started around 1922, with money given by the New York State Legislature in 1921 Construction of the new road was completed in 1922, extending along the borderline with the Harriman estate. Originally, people to cross the Erie Railroad tracks and the Ramapo River to continue along Arden Valley Road. This was remedied by building an underpass under the Erie Railroad and a ford over the Ramapo River. When the New York State Thruway was constructed through the Hudson Valley in 1953, engineers included the ford in construction, and as of 1999, the structure still stands.
