The old bridge was designed by C. Shaler Smith and built by the Edgemoor Bridge Works. It consisted of three deck trusses of the Whipple type, supporting a highway on the bottom chord, together with five approach spans of the Fink type. Of the three spans included in the river portion of the old structure, the two shore spans were each 272 feet in length, 39 feet in depth center to center of the pins, and 18 feet center to center of the trusses. The shore ends of these two spans rested on stone abutments and the river ends on steel bents 78 feet in height, with the trusses cantalevered over forming the middle span 324 feet in length. One 60-foot and one 40-foot Fink truss supported at their intersections on a rocker bent formed the west approach and three 60-foot Fink trusses on rocker bents on the east approach.
The first image shows what may be a Fink or two as approach spans on the far shore. The lack of resolution makes it difficult to confirm. If the build date of 1880 is accurate, it seems quite late for a Fink truss.
Also, does anyone know the type of compression member used on the Whipples?
Regards,
Art S.
Pretty sure I'm seeing fink elements on the main span.
This is listed as having a fink deck truss approach span. But the photos does not show any fink. What little I have found on it does not mention a Fink deck truss.
Is there really a fink?
The Google digitize book that supplied the photo describes the Fink trusses. So I quoted the relevant part in the description and expanded the design section.
Thanks for the additional images, Luke!