Interstate 172

---

title: "Interstate 172" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["interstate-highways-in-illinois", "auxiliary-interstate-highways", "interstate-72", "transportation-in-pike-county,-illinois", "transportation-in-adams-county,-illinois"] description: "Interstate Highway in Illinois" topic_path: "sports" source: "https://en.wikipedia.org/wiki/Interstate_172" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Interstate Highway in Illinois ::

::data[format=table title="Infobox road"]

Field	Value
state	IL
route	172
type	I
map
map_custom	yes
map_notes	I-172 highlighted in red
established	1995
length_mi	19.69
length_ref
spur_type	I
spur_of	72
direction_a	South
terminus_a	near Hull
direction_b	North
terminus_b	near Quincy
counties	Pike, Adams
previous_type	IL
previous_route	171
next_type	IL
next_route	172
::

|state=IL |route=172 |type=I |map= |map_custom=yes |map_notes=I-172 highlighted in red |established=1995 |length_mi=19.69 |length_ref= |spur_type=I |spur_of=72 |direction_a=South |terminus_a= near Hull |direction_b=North |terminus_b= near Quincy |counties=Pike, Adams |previous_type=IL |previous_route=171 |next_type=IL |next_route=172 Interstate 172 (I-172) is a spur route, the only auxiliary route of I-72. It is located entirely within the US state of Illinois and is completely concurrent with IL 110. The highway runs north from its start outside of Hannibal, Missouri, to about 2.5 mi west of Fowler. At U.S. Route 24 (US 24), I-172 becomes Illinois Route 336 (IL 336), which runs north and east to Macomb via Carthage. The entire portion of I-172 and I-72 from I-172 east to Springfield is also known by its former name, the Central Illinois Expressway. I-172 is 19.69 mi long.

Route description

I-172 begins at a trumpet interchange with I-72/US 36, about 5 mi east of Hannibal before immediately entering Adams County while concurrent with IL 110 (Chicago–Kansas City Expressway). I-172 enters the Quincy area at exit 10 (IL 96), passing to the far east of the city. I-172 ends just northeast of Quincy, ending at US 24, continuing north as IL 110/IL 336.

History

I-172 originally was what I-72 is now from Springfield to the current interchange with I-172. This was approved by the American Association of State Highway and Transportation Officials (AASHTO) on June 9, 1991.

On April 23, 1995, after a reexamination by the Federal Highway Administration (FHWA), the highway to Hannibal was redesignated I-72, with the highway north to Quincy redesignated as I-172. The highway is non-chargeable, meaning that, even though it is an Interstate (designed and constructed to Interstate Highway standards and specifications), it was not built with federal funds.

Exit list

|county=Pike |location=Levee Township |ctdab=Pike |mile=0.00 |exit=0 |road= |notes=Southbound exit and northbound entrance; southern terminus, exit 0 is for 72 west; exit 4 eastbound/4A westbound on I-72. |county=Adams |cspan=5 |location=Fall Creek Township |ctdab=Adams |mile=3.18 |exit=2 |road= |location=Melrose Township |ctdab=Adams |mile=10.52 |exit=10 |road= |location=Quincy |mile=14.47 |exit=14 |road= |notes=Serves Quincy Airport |location=Ellington Township |lspan=2 |ctdab=Adams |mile=15.90 |exit=15 |road=Columbus Road, Wismann Lane |mile=19.69 |exit=19 |road=

|notes=Roadway continues as IL 110/IL 336

References

References

1. Illinois Technology Transfer Center. (2007). "T2 GIS Data".
2. Schoenburg, Bernard. (1995-04-28). "Road to the top? Designation puts expressway in the 'big leagues'". The State Journal-Register.
3. Kurumi. (April 2022). "Interstate x72". Kurumi.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::