Swing Span from Northwest
This bridge is a major river span and had, at the time of its construction, the longest and heaviest electrified swing span on the Mississippi River. The bridge superstructure was built by American Bridge Company, one of the largest bridge companies in American history.
Photo by Joe Elliott, Summer 1995, for HAER
View photos at Library of Congress
BH Photo #123499
On the Illinois historical aerial photography website I found a late 1920s aerial view of the railroad/highway bridge at Fort Madison. I'd say this photo was taken not too long after the current bridge was completed. The original 1880s swing bridge is shown too, though the swing span and western approach have already been removed. This photo clearly shows that the current 1920s bridge was built upstream from the original 1880s bridge it replaced.
The photo is also upside down, with south up and north down.
http://crystal.isgs.uiuc.edu/nsdihome/webdocs/umr1927/aerial...
http://crystal.isgs.uiuc.edu/nsdihome/webdocs/umr1927/aerial...