Illinois Route 173

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Illinois Route 173 marker

Illinois Route 173
Route information
Maintained by IDOT
Length: 66.20 mi[2] (106.54 km)
Existed: 1924[1] – present
Major junctions
West end: IL 251 in Machesney Park
  I-39 / I-90 / US 51 in Loves Park
US 14 in Harvard
US 12 in Richmond
US 45 in Antioch
I-94 in Zion
US 41 in Zion
East end: IL 137 in Zion
Counties: Lake, McHenry, Boone, Winnebago
Highway system
IL 172 IL 174

Illinois Route 173 is an east–west state road that runs from Illinois Route 251 in the Rockford suburb of Machesney Park east to Illinois Route 137 (Sheridan Road/Buckley) in Zion near the Illinois-Wisconsin border; this is a distance of 66.20 miles (106.54 km).[2] Illinois Route 173 is also one of the northernmost east-west state highways in Illinois. On Interstate 94 (Tri-State Tollway) traveling south from Wisconsin, it is the second road seen which has an interchange at that location. Similarly, when traveling south/east from Wisconsin on Interstate 39/90 (Jane Addams Memorial Tollway), Illinois Route 173 is only the third exit into Illinois. In 2008, the entirety of Illinois 173 has been designated the 173rd Airborne Brigade Highway

Route description[edit]

Illinois 173 travels across relatively hilly northern Illinois from the Rockford area to Zion. This area is more densely populated than other portions of rural Illinois. It is two lanes for over 90% of its length.

In July 2007, a new interchange was constructed at Illinois 173 and Interstates 39/90 (Jane Addams Memorial Tollway).

Local Road Names[edit]

From east to west, Illinois Route 173 is known by local road names through the towns it traverses.

  • 21st Street, Bethlehem Avenue, Rosecrans Road in Zion
  • Kenosha Street in Richmond
  • Maple Avenue in Hebron
  • Diggins Street, Division Street, Brink Street in Harvard
  • Main Street in Capron
  • Grove Street in Poplar Grove
  • West Lane Road in Machesney Park


SBI Route 173 originally ran from near downtown Rockford (along Forest Hills Road) to Zion. During the 1980s, when the village of Machesney Park was heavily developed and incorporated, Illinois Route 173 was scaled back and its western terminus moved to Illinois Route 251 (North 2nd Street). From 1972 to 1994 the highway also assumed a portion of what is now Illinois Route 137 north to the Wisconsin border. 3[1]

Major intersections[edit]

County Location mi km Destinations Notes
Winnebago Machesney Park IL 251
I-39 / I-90 / US 51 (Jane Addams Memorial Tollway) – Chicago, Madison, Rockford
Boone Caledonia IL 76
McHenry Harvard US 14 east West end of US 14 overlap
US 14 west East end of US 14 overlap
Hebron IL 47
Richmond US 12
Lake Antioch IL 59 south
IL 83
Antioch US 45
Old Mill Creek I-94 east (Tri-State Tollway)
Rosecrans US 41
Zion IL 131
IL 137
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Carlson, Rich (2005-04-15). "Illinois Highways Page: Routes 161 thru 180". Retrieved 2006-08-15. 
  2. ^ a b Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08. 

Route map: Bing / Google