Marseilles Bridge over Illinois River & Illinois Waterway canal
official name was Clark-Adams Bridge
GS, December 1976
License: Released into public domain
BH Photo #319809
You might need to move the lost date forward a year.
My late wife and I were married on May 2nd 1998 and our honeymoon road trip that took us to Springfield led us to stop to pay a visit to my grandfather's sister as well as stop by gram and gramps graves in Marseilles on our way home.
We came into town on May 5th and the nav channel span was already gone and the remaining spans were siting in the original river channel having been blasted fairly recently.
IIRC the official opening of the new bridge was sometime in early mid December of 97 so weather would have set in and put off full demo until weather broke in the spring.
Using the Seneca bridge demo (and taking into account the Seneca "misfire") my best guess would be late April/early May of 98 for the loss of the Clark-Adams.
The 1885 span was a very long Columbia Bridge Works structure.
So glad to see that somebody finally put the old Marseilles bridge on this site! That was a very fascinating (yet creepy) structure!