Illinois Route 158 is somewhat of a circumferential route around the southern and southeastern sides of the Metro-East. It starts at Illinois 3 south of St. Louis and heads easterly, then northerly to end at Interstate 64. This page will identify a western end and a northern end to Illinois 158, as the route begins with an easterly component followed by a northerly component; in other words, it appears like a backwards "L" on maps.
Illinois 158's western end is a trumpet interchange in Columbia at Illinois 3...
Illinois 158's western end is a trumpet interchange in Columbia at Illinois 3...
Illinois 158 meets Illinois 163 at that route's southern end in Millstadt...
Illinois 158 crosses Illinois 15 at a diamond interchange, and Illinois 13 joins Illinois 158 immediately after the overpass...
As Illinois 13 departs to the southeast, Illinois 158 picks up a new companion, Illinois 177, and heads east!
The concurrency ends as Illinois 177 continues east, but Illinois 158 turns northerly:
Illinois 158 cuts west slightly using a concurrency with Illinois 161:
Shortly after joining Illinois 161 west, Illinois 158 continues north:
Illinois 158 reaches its northern end at Interstate 64; continuing north will put you on US Route 50 eastbound, as that route deviates from Interstate 64 at this point.
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The northern end marker for Illinois 158 actually sits at the very next intersection to the north, where US Route 50 makes a right turn bound for Lebanon, Illinois.
