Illinois Route 31 runs north-south through the Fox Valley area of the far western Chicago suburbs, and extends north through McHenry County, almost to the Wisconsin border. From Oswego northward, it follows the west side of the Fox River, whereas Illinois 25 follows the east shore of that river.
The north end of Illinois 31 is at US Route 12 in Richmond; US Route 12 continues straight north from here to Wisconsin:
The north end of Illinois 31 is at US Route 12 in Richmond; US Route 12 continues straight north from here to Wisconsin:
In McHenry, Illinois 31 joins Illinois 120 west for a short distance:
Still in McHenry, Illinois 31 splits from Illinois 120, which continues west:
Illinois 31 crosses Illinois 176 in Crystal Lake:
Illinois 31 serves as somewhat of an expressway and a diamond configuration of ramps accesses US Route 14...
In Algonquin, Illinois 31 has another short freeway segment, with a diamond interchange to Illinois 62:
In West Dundee, Illinois 31 crosses Illinois 72:
Illinois 31 meets Interstate 90 at a cloverleaf interchange as it crosses into Elgin:
After passing through downtown Elgin, Illinois 31 meets US Route 20 at a diamond interchange...
Illinois 31 crosses Illinois 64 in St. Charles:
Soon after, in Geneva, Illinois 31 crosses Illinois 38...
In North Aurora, Illinois 56 comes from the east and joins Illinois 31 southward:
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Crossing from North Aurora into Aurora, Illinois 31 meets a trumpet spur with Interstate 88, and Illinois 56 joins that tollway westward:
After passing through downtown Aurora, Illinois 31 meets a folded diamond interchange with the big US Route 30 bridge that carries that route over the Fox River:
The southern end of Illinois 31 is at US Route 34 in Oswego, at the western approach to Route 34's bridge over the Fox River:
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