Note that two suspension cables hang from the top of each tower leg. The 107,000 miles of steel wire used for the suspension cables were manufactured by John Roebling & Sons, whose founder had designed the Brooklyn Bridge. Contractors were allowed to bid the job with either suspension cables or with suspension chains, which seems unthinkable now.
When the bridge was first built, the deck was supported by very thin (twelve-foot deep) plate girders under the roadway. The theory was that the enormous mass of the long deck would act as a stiffener to prevent large movements during windstorms. It may have been fortunate therefore, that they later put a lower deck on the bridge with a deep truss.
We've looked at every river crossing connected to Manhattan, but there are many other interesting bridges in the area. The Bayonne Bridge (1931), the Bronx-Whitestone Bridge (1939), the Throgs Neck Bridge (1961), and the Verrazano-Narrows Bridge (1964) were all designed by Othmar Ammann during the golden age of bridge engineering for New York City.