Illinois Route 173

Illinois Route 173 (IL 173) is a 66.20-mile-long (106.54 km) eastwest 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.[1] 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[3]

Illinois Route 173
173rd Airborne Brigade Highway
IL 173 highlighted in red
Route information
Maintained by IDOT
Length66.20 mi[1] (106.54 km)
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
CountiesLake, McHenry, Boone, Winnebago
Highway system
IL 172IL 174

Route description

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, Interstates 39/90, and U.S. Route 51 (Jane Addams Memorial Tollway).


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. [2]

Major intersections

WinnebagoMachesney Park0.00.0 IL 251 (2nd Street)
Machesney ParkLoves Park
village line
1.32.1 CR 11 (Perryville Road)
I-39 / I-90 / US 51 (Jane Addams Memorial Tollway) Chicago, Rockford, Madison
Caledonia4.67.4 CR 25 (Belvidere Road)
Boone9.415.1 IL 76 (Fairgrounds Road)
McHenryHarvard22.836.7 US 14 east (Division Street)West end of US 14 overlap
23.337.5 US 14 west (Division Street)East end of US 14 overlap
25.440.9 CR A18 east (Altenberg Road)
Alden28.946.5 CR A15 west (Oak Grove Road)
Hebron34.154.9 IL 47 (Main Street)
Richmond39.162.9 CR V30 (Keystone Road)
40.665.3 US 12 (Main Street)
Spring Grove44.571.6 CR V43 south (Richardson Road)
LakeAntioch48.578.1 CR V51 north (Lake Avenue)
51.382.6 IL 59 south
52.183.8 IL 83 (Main Street)
56.190.3 US 45
Old Mill Creek58.393.8 CR W15 (Hunt Club Road)
I-94 east (Tri-State Tollway) Chicago
Rosecrans59.796.1 US 41 (Skokie Highway) to I-94 west
Zion63.0101.4 IL 131 (Green Bay Road)
64.4103.6 CR W34 (Lewis Avenue)
66.20106.54 IL 137 / LMCT (Sheridan Road)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08.
  2. Carlson, Rich (2005-04-15). "Illinois Highways Page: Routes 161 thru 180". Retrieved 2006-08-15.
  3. "Illinois General Assembly - Full Text of HR0886".
  4. Google (March 10, 2017). "Overview Map of IL 173" (Map). Google Maps. Google. Retrieved March 10, 2017.

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