Illinois State Route 3 runs north-south along the Mississippi River and the Illinois/Missouri State Line. Portions of this highway runs with the Poplar Street Bridge Complex in East St. Louis. IL St Rt 3 passes through the following towns in St. Clair County. Brooklyn
Interstate 255, from Dupo to the St. Clair/Monroe County Line.
U.S. Rt. 50, from Dupo to the St. Clair/Monroe County Line. IL St Rt 3 intersects the following highways in St. Clair County. Interstate 64, at East St. Louis. Interstate 55, at East. St. Louis. Interstate 70, at East St. Louis.
A set of junction markers on NB Old IL St Rt 3. A BGS on NB I-255/EB U.S. Rt. 50. NB I-255/EB U.S. Rt. 50 at the split from NB IL St Rt 3. NB IL St Rt 3 north of I-255/U.S. Rt. 50. NB IL St Rt 3 in Dupo. A BGS on NB IL St Rt 3. NB IL St Rt 3 near I-55/64/70; U.S. Rt. 40. SB IL St Rt 3 at the Illinois Welcome Sign just south of the Poplar Street Bridge Complex. A BGS on NB I-55; EB I-64/70. 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. A BGS on SB I-55/IL St Rt 3; WB I-64/70; U.S. Rt. 40. Another BGS on NB I-55/IL St Rt 3; EB I-64/70/U.S. Rt. 40. NB I-55/IL St Rt 3; EB I-64/70; EB U.S. Rt. 40 at the Illinois Welcome Sign. (September, 2007) NB IL St Rt 3 north of I-55/64/70; U.S. Rt. 40.
