Illinois Route 170

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Illinois Route 170 marker

Illinois Route 170
Route information
Maintained by IDOT
Length: 25.00 mi[1] (40.23 km)
Existed: 1946[2] – present
Major junctions
South end: IL 23 in Cornell
North end: US 6 in Seneca
Counties: Livingston, LaSalle
Highway system
IL 169 IL 171

Illinois Route 170 is a north–south state road in north-central Illinois. It runs from Illinois Route 23 well north of Pontiac to U.S. Route 6 in Seneca. This is a distance of 25.00 miles (40.23 km).[1]

Route description[edit]

A view of Illinois Route 170 in Seneca, Illinois looking north

Illinois 170 is a rural, two-lane surface road for its entire length. The road crosses Illinois River via a four-span truss bridge.[3] As of May 5, 2006, the Illinois Department of Transportation is looking to replace the 74 year old bridge.[4] The old bridge was imploded on November 18, 2010.


SBI Route 160 originally ran from Red Bud to Sparta; this became Illinois Route 154 in 1937. In 1946, it replaced Illinois Route 186 from Seneca south to Illinois Route 17 near Budd. In 1995 Illinois 170 was extended further south to Illinois 23.[2]


  1. ^ a b Illinois Technology Transfer Center (2006). "T2 GIS Data". Retrieved 2007-11-08. 
  2. ^ a b Carlson, Rich (2005-04-15). "Illinois Highways Page: Routes 161 through 180". Retrieved 2006-08-14. 
  3. ^ Baughn, James et al. (2006-01-09). "Historic Bridges of the U.S. – Seneca Bridge, LaSalle County, Illinois". Retrieved 2006-08-15. 
  4. ^ Illinois Department of Transportation (2006-05-05). "Open House Public Hearing Meeting: For Removal And Replacement Of The Illinois 170 Bridge Over The Illinois River In Seneca". Retrieved 2006-08-15.