Upper Pacific Mills Bridge (USA)
This wrought iron bowstring arch bridge was completed in 1864 by the Moseley Iron Building Works of Boston, to connect the Pacific Mills with Canal Street in Lawrence, Massachusetts, by spanning the North Canal.
It is one of the oldest iron bridges in the United States. It was the first bridge in the United States to use riveted wrought iron plates for the triangular-shaped top chord.
The bridge partially collapsed in the late 1980s, but in 1989 it was removed to the Merrimack College campus in North Andover and was rehabilitated under the direction of Francis E. Griggs, Jr., Professor of Civil Engineering. It was placed over a campus pond as a footbridge.
See Wikipedia entry.
The deck is suspended from the triangular section arched top chord (apex at the top), made from riveted wrought iron plates. I. K. Brunel's large 1849 Windsor Railway Bridge had arched triangular wrought iron chords, but there any resemblance ends. Brunel's arches were part of a bowstring truss girder system, and the triangles had the apex at the bottom.