Interstate 70 in Illinois

This article is about the section of Interstate 70 in Illinois. For the entire length of the highway, see Interstate 70.

Interstate 70
Route information
Maintained by IDOT
Length:	160 mi (257 km)
Major junctions
West end:	US 40 / I-55 / I-64 / I-70 in East St. Louis
	I-64 in East St. Louis I-255 in Collinsville US 40 in Troy I-55 / I-270 in Troy US 51 in Vandalia I-57 near Effingham US 45 in Effingham US 40 near Marshall
East end:	US 40 / I-70 near Marshall
Location
Counties:	St. Clair, Madison, Bond, Fayette, Effingham, Cumberland, Clark
Highway system
Interstate Highway System Main Auxiliary Business Illinois state highway system Illinois Tollway system ← IL 69 IL 70 →

Interstate 70 (I-70) is a part of the Interstate Highway System that runs from Cove Fort, Utah to Baltimore, Maryland. In the U.S. state of Illinois, the Interstate highway runs 160 miles (260 km) from the Missouri state line at the Mississippi River in East St. Louis east to the Indiana state line near Marshall. I-70, which runs in a generally east-northeast direction across the state parallel to and sometimes concurrent with U.S. Route 40 (US 40), connects St. Louis and the Metro-East region of Illinois with the Indiana cities of Terre Haute and Indianapolis, as well as many small towns along the northern edge of Southern Illinois and the southern tier of the Central Illinois region. Within Metro-East, I-70 has junctions with I-64 in East St. Louis and I-55 near Troy; these three Interstates cross the Mississippi River into St. Louis together. I-70 also intersects the two Interstates that form St. Louis's beltway: I-255 near Collinsville and I-270 at the I-55 junction near Troy. East of the Metro-East region, I-70 meets US 51 in Vandalia and both I-57 and US 45 in Effingham. Like all Interstate highways, I-70 is a part of the National Highway System for its entire length in Illinois.

Route description

I-70 enters Illinois from St. Louis by crossing the Mississippi River on the eight-lane Poplar Street Bridge into the city of East St. Louis in St. Clair County. I-70 runs concurrently with I-55, I-64, and US 40 entering the state. At the east end of the bridge, the Interstate splits into express and local lanes, both with two lanes each direction, as it passes through a pair of directional interchanges. The first interchange is for IL 3, which heads south toward Cahokia, and the second is for Tudor Avenue and Piggott Avenue, which form a one-way pair in a residential area of East St. Louis. The east end of the interchange complex has an eastbound exit to Fourth Street and a westbound entrance from Main Street. IL 3 joins the highway to form a five-way concurrency, which reduces from eight to six lanes. The Interstate curves around downtown East St. Louis and has two partial interchanges, both with westbound exit and eastbound entrance, for the Martin Luther King Bridge and Eads Bridge toward Downtown St. Louis; both roadways temporarily expand to five lanes. I-64 and IL 3 (St. Clair Avenue) leave the concurrency at the next interchange, taking two lanes from each direction. I-70 and I-55 have a westbound exit to and eastbound entrance from Exchange Street before the Interstate leaves the city of East St. Louis by crossing over the main east–west railroad line.

I-70 and I-55 have an interchange with IL 203 before entering Madison County. The Interstate has a diamond interchange with IL 111 just north of Fairmont City and a partial interchange with Black Lane before the highway's interchange with I-255 west of Collinsville. I-70 and I-55 curve northeast around Collinsville and leave the floodplain of the Mississippi River at the interchange with IL 157 (Bluff Road), where the highway reduces to four lanes. The Interstate passes between Collinsville and Maryville, which are both served by the next interchange with IL 159 (Vandalia Street/Maryville Road). US 40 leaves the freeway at a trumpet interchange southwest of Troy. I-70 and I-55 curve to the north and meet IL 162 (Edwardsville Road) before I-70 and I-55 diverge at the highways' interchange with I-270. The interchange, Exit 20, is a full cloverleaf except for a flyover ramp for westbound I-70 to join southbound I-55. Westbound I-70's interchange number is Exit 15, marking the continuation of I-270's number sequence that I-70 will carry east to Indiana.

I-70 meets IL 4 and IL 143 to the south and east of Marine before crossing Highland Silver Lake. US 40 joins I-70 again near Pierron, Illinois and run concurrently into Bond County, where the highways separate at Pocahontas, where I-70 crosses Shoal Creek. US 40 continues to closely parallel I-70 until the next interchange, which is a connector to US 40 southwest of Greenville. The two highways pass to the south of Greenville, which is also served via an interchange with IL 127. East of Mulberry Grove, I-70 and US 40 cross to the north side of the east–west rail line and again closely parallel each other into Fayette County. I-70 passes along the northern edge of Vandalia, with access to the county seat of Fayette County provided by an interchange with US 40 on the west side and US 51 (Kennedy Boulevard) to the north. Just east of US 51, I-70 crosses the Kaskaskia River. I-70 crosses to the south side of both the rail line and US 40 (Cumberland Road) between Bluff City and Brownstown. The Interstate passes to the south of St. Elmo before entering Effingham County to the west of an interchange with IL 128 at Altamont.

Immediately after crossing the Little Wabash River, I-70 joins I-57 in a concurrency to pass around the west and north sides of Effingham. The two Interstates use I-57's exit sequence during the overlap. I-70 and I-57 intersect Fayette Avenue, IL 32 and IL 33 (Keller Drive), and US 45 (Third Street) before diverging near Teutopolis. Just east of Montrose, I-70 enters Cumberland County, where the Interstate has one interchange with IL 130 (Haughton Highway) at Greenup, where the highway crosses the Embarras River. The Interstate continues into Clark County for an interchange with IL 49 north of Casey. I-70 crosses the North Fork Embarras River north of Martinsville, then has a junction with IL 1 north of the county seat of Marshall. Northeast of Marshall, US 40 joins I-70 in a concurrency. The Interstate and U.S. highway cross the Indiana state line west of Terre Haute while closely paralleling the original alignment of US 40, Illiana Drive.

Exit list

I-70 uses the I-55 exit number sequence between the Missouri state line and the I-55/I-70/I-270 interchange (exits 1–20). East of the I-55/I-70/I-270 interchange, I-70 uses the I-270 exit numbering, beginning with exit 15 at I-55/I-70/I-270. I-70 uses I-57's exit number sequence during their overlap around Effingham.

County	Location	Mile	km	Exit	Destinations	Notes
St. Clair	East St. Louis			—	I-70 west / I-55 south / I-64 west / US 40 west – St. Louis, Kansas City	Western terminus of I-70 in Illinois; Missouri state line on the Poplar Street Bridge over the Mississippi River
				1	IL 3 south / Great River Road – Cahokia	West end of IL 3 overlap
				2A	Martin Luther King Bridge – Downtown St. Louis	Westbound exit and eastbound entrance
				2B	Great River Road – Eads Bridge	Westbound exit and eastbound entrance
				2C	I-64 east / IL 3 north (St. Clair Avenue) – Louisville	Signed as exit 2 eastbound; East end of IL 3 overlap; East end of I-64 overlap
				3	Exchange Avenue	Westbound exit and eastbound entrance
	Canteen Township			4	IL 203 – Granite City, Fairmont City	Split into exits 4A (south) and 4B (north) westbound
Madison	Nameoki Township			6	IL 111 / Great River Road – Wood River, Washington Park
				9	Black Lane south	Eastbound exit and westbound entrance
	Collinsville Township			10	I-255 – Memphis, Interstate 270
				11	IL 157 (Bluff Road) – Collinsville, Edwardsville
	Maryville			15	IL 159 (Vandalia Street/Maryville Road) – Collinsville, Maryville	Split into exits 15A (south) and 15B (north)
	Jarvis Township			17	US 40 – St. Jacob, Highland	East end of US 40 overlap
	Troy			18	IL 162 (Edwardsville Road) – Troy
	Pin Oak Township			20/15	I-55 north / I-270 west – Springfield, Chicago, Kansas City	East end of I-55 overlap; Split into exits 20A (I-70) and 2B (I-270) eastbound, with no exit number for I-55; Exit 15B westbound is for I-55, with no exit number for I-270
	Marine Township			21	IL 4 – Staunton, Lebanon
				24	IL 143 – Marine, Highland
	Saline Township			30	US 40 west / IL 143 (Steiner Road) – Pierron, Highland	West end of US 40 overlap
Bond	Old Ripley Township			36	US 40 east (Pokey Road) – Pocahontas	East end of US 40 overlap
	Central Township			41	To US 40 / Millersburg Road – Greenville
				45	IL 127 – Greenville, Carlyle
	Pleasant Mound Township			52	Mulberry Grove Road – Mulberry Grove, Keyesport
Fayette	Vandalia Township			61	US 40 – Vandalia
	Vandalia			63	US 51 (Kennedy Boulevard) – Vandalia, Pana
	Otego Township			68	US 40 (Cumberland Road) – Brownstown, Bluff City
	St. Elmo			76	Interstate Drive – St. Elmo
Effingham	Altamont			82	IL 128 north (Main Street) – Altamont
	Summit Township			92	I-57 south – Memphis	West end of I-57 overlap; Westbound I-70 exits I-57 via exit 157
	Effingham			159	Fayette Avenue – Effingham
				160	IL 32 / IL 33 (Keller Drive)
				162	US 45 (Third Street) – Sigel
	Teutopolis Township			98	I-57 north – Chicago	East end of I-57 overlap; Eastbound I-70 exits I-57 via exit 163
	Montrose			105	Spring Creek Road – Montrose
Cumberland	Greenup			119	IL 130 (Haughton Highway) – Greenup, Charleston
Clark	Casey Township			129	IL 49 – Casey
	Martinsville			136	Cleone Road – Martinsville
	Marshall Township			147	IL 1 – Marshall, Paris
	Wabash Township			154	US 40 west	West end of US 40 overlap
				—	I-70 / US 40 east – Terre Haute, Indianapolis	Eastern terminus of I-70 in Illinois; Indiana state line
Concurrency terminus       Closed/former       HOV only       Incomplete access       Tolled/ETC       Unopened

References

Template:Attached_KML/Interstate 70 in Illinois

Interstate 70
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