U.S. Federal Route 40 runs completly in the Interstate 55/70 corridor in St. Clair County. Much of this is on the Poplar Street Bridge Complex. U.S. Rt. 40 passes through the following towns in St. Clair County. Fairmont City Madison East St Louis
U.S. Rt. 40 is multi-plexed in St. Clair County. Interstate 55, through St. Clair County. Interstate 70, through St. Clair County. Interstate 64, at East St Louis.
NB I-55; EB I-64/70; U.S. Rt. 40 at the Illinois/Missouri State Line. Loking north along I-55/64/70; U.S. 40; IL in East St. Louis. Photo from SB I-55/IL St Rt 3; WB I-64/70-U.S. 40 to Tudor Ave. Overhead signage just over the Illinois State Line at the Poplar Street Bridge, St. Louis, MO. SB I-55; WB I-64/70-U.S. Rt. 40 as seen from the Union Pacific railroad overpass in the photo above. The Illinois Welcome Sign on NB I-55/IL St Rt 3; EB I-64/70; EB U.S. Rt. 40. (September, 2007) NB I-55; EB I-70/U.S. Rt. 40 near IL St Rt 203.
