Abstract This journal appears to be a unique record of daily on site observations and construction processes of the building of a second Harlem River bridge at the site of Third Avenue, County of New York (Manhattan). It contains copied documents such as the New York State Legislature’s document Chapter 774 dated April 17, 1857 authorizing the building of a new bridge at the site, as well as the design requirements for the new bridge, removal of the previous bridge and the official appointment and...