Old iron bridge runs across stream bordering park. Plaque on bridge reads BUILT 1890 BY DEAN WESTBROOK BRIDGE ENGINEERS N.Y. SELECTMEN W.H. GLOVER. J. GREEN. C.WINTON. CLERK M.J. HOULUHAN The steel used is stamped PHONIX IRON CO. PHILAD P.A.

From the path that runs by the stream can be seen an old spillway. In 1839, Charles Goodyear discovered the process for vulcanizing rubber at a shop in Sandy Hook which gave rise to the American rubber industry and lead to the establishment of a rubber factory in Rocky Glen. There was a plaque at the park that said the Irish workers lived on the side of the river that the park is on and crossed over the old iron bridge to work at the rubber factory.

The history of this area is quite interesting particularly since this factory is in quite good shape. This is one of two multi-story brick buildings that remain today. The other was a mill, 2 miles from this factory.