This is a pair of bridges over the Cal Sag Channel in Blue Island. Adjacent structures are the Blue Island yard and the Western Avenue Bridge. Builder is unknown. Date of construction mid 20th century.
The bridges are metal 12 panel rivet-connected polygonal Warren through truss, fixed. Largest span is 400 feet. There is one main span. There are two tracks on the east bridge. There is one track on the west bridge.
The bridges were built for the Rock Island Railroad. The tracks lead to downtown Chicago.
The tracks currently service Metra Rock Island commuter trains and occasional freight trains.