Illinois Route 176

Illinois Route 176 (IL 176) is a 41.28-mile-long (66.43 km) eastwest state route in northern Illinois. It runs from IL 23 (State Street) in Marengo to the southern terminus of IL 131 (Green Bay Road) in Lake Bluff.[1]

Illinois Route 176
IL 176 highlighted in red
Route information
Maintained by IDOT
Length41.28 mi[1] (66.43 km)
Major junctions
West end IL 23 in Marengo
  US 14 in Crystal Lake

IL 31 in Crystal Lake
US 12 / IL 59 in Wauconda

US 45 in Mundelein
I-94 in Lake Bluff
US 41 in Lake Bluff
East end IL 131 in Lake Bluff
CountiesMcHenry, Lake
Highway system
IL 175IL 177
US 67IL 68

Route description

IL 176 is a two- to four-lane arterial in northern Illinois. The eastern terminus of IL 176 is unique in that both IL 131 and IL 176 terminate at that corner; neither state route extends beyond that point in any direction.

IL 47 overlaps IL 176 east of Marengo.


SBI Route 176 originally ran from Crystal Lake to Lake Bluff. In 1941, the designation was extended westward to Marengo, replacing IL 67, redundant to the newly-designated US 67.[3]


The village of Wauconda hired an engineering firm in 2014 to suggest improvements to the congested interchange with US 12. They proposed eliminating the interchange and converting it to an at-grade intersection with dual left turn lanes at each leg, two lanes in each direction for IL 176, three lanes in each direction of US 12, and developing the frontage of the intersection. The estimated cost to convert the US 12 interchange with IL 176 and the US 12 interchange with IL 59 to at-grade signalized arterial intersections is $300 million, none of which would come from IDOT.[4][5]

Major Intersections

McHenryMarengo0.00.0 IL 23Western terminus of IL 176
9.014.5 IL 47 north WoodstockWest end of IL 47 concurrency
9.815.8 IL 47 south HuntleyEast end of IL 47 concurrency
Crystal Lake13.822.2 US 14 (Virginia St) Woodstock
16.827.0 IL 31
LakeWauconda25.240.6 US 12 (Rand Rd)interchange
25.941.7 IL 59 south (Barrington Rd)Northern terminus of IL 59
Mundelein31.450.5 IL 60 / IL 83
33.353.6 US 45 (Lake St)
Libertyville36.158.1 IL 21 (Milwaukee Ave)
Green Oaks38.361.6 I-94 east (Tri-State Tollway) Indiana
Lake Bluff40.064.4 IL 43 (Waukegan Rd)
40.364.9 US 41 (Skokie Hwy)
41.2866.43 IL 131 north (Green Bay Rd)Eastern terminus of IL 176; southern terminus of IL 131
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 2006-05-30.
  3. "New Delhi Road Designated As Part of U.S. 67". The Alton Evening Telegraph. March 20, 1941. p. 2. Retrieved November 4, 2015 via
  4. Lissau, Russell (March 25, 2014). "Transportation Improvements Recommended for Wauconda". Daily Herald. Arlington Heights, IL. Retrieved May 25, 2015.
  5. Grieve, Bill; Larson, Amanda; Brinkman, Dan (April 1, 2014). Illinois Route 176 Corridor (PDF) (Report). Gewalt Hamilton Associates. Retrieved May 25, 2015.
  6. Google (March 11, 2017). "Overview Map of IL 176" (Map). Google Maps. Google. Retrieved March 11, 2017.

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