Interstate 70 in Illinois

Interstate 70
Route information
Maintained by IDOT
Length:	160 mi[1] (260 km)
Major junctions
West end:	I-70 at the Missouri state line in Brooklyn, Illinois
	I-55 / 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 at the Indiana state line 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 Suffixed Business Future Illinois State Highway System Interstate U.S. State Tollways ← IL 68 IL 70 →

Interstate 70 (I-70) is a part of the Interstate Highway System that travels from Cove Fort, Utah to Baltimore, Maryland. In the U.S. state of Illinois, the Interstate highway travels 160 miles (260 km) from the Missouri state line at the Mississippi River in Brooklyn east to the Indiana state line near Marshall. I-70, which travels 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 interchanges with I-64 in East St. Louis and I-55 near Troy. I-70 also has interchanges with 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.^[2]

Route description

I-70 enters Illinois from St. Louis by crossing the Mississippi River on the four lane Stan Musial Veterans Memorial Bridge into the village of Brooklyn in St. Clair County. The first interchange is for IL 3, which heads south toward Cahokia; the interstate has an interchange with I-64 towards Fairview Heights, and I-55, which it joins and heads northeast.^[1]

I-55/I-70 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 one with Black Lane before the highway's interchange with I-255 west of Collinsville. I-55/I-70 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-55/I-70 curve to the north and meet IL 162 (Edwardsville Road) before they diverge at their 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 is exit 15; the exits east of that are numbered as if I-70 had run along I-270 for the first few miles in Illinois.^[1]

I-70 meets IL Routes 4 and 143 to the south and east of Marine before crossing Highland Silver Lake. US 40 rejoins I-70 near Pierron and the two highways travel concurrently into Bond County, where they separate at Pocahontas. Here, 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/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.^[1]

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 concurrency. I-57/I-70 have interchanges with 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 an interchange with IL 1 north of the county seat of Marshall. Northeast of Marshall, US 40 rejoins I-70 in a concurrency. The highways cross the Indiana state line west of Terre Haute while closely paralleling the original alignment of US 40, Illiana Drive.^[1]

Exit list

County	Location	mi	km	Exit	Destinations	Notes
Mississippi River		0.00	0.00		I-70 west – Kansas City	Continuation into Missouri
				Stan Musial Veterans Memorial Bridge; Illinois-Missouri state line
St. Clair	Fairmont City			2	To IL 3 / Fairmont City Boulevard
	East St. Louis			3	I-64 east – Louisville	No westbound exit; I-64 exit 3B
				—	I-55 / IL 3 / Great River Road south / I-64 / US 40 west – St. Louis	Western end of I-55 concurrency; westbound exit and eastbound entrance; former I-70 west; I-55 exit 3B
				3C	Exchange Avenue	Westbound exit and eastbound entrance; access to Emerson Park MetroLink station
	Canteen Township			4	IL 203 (Collinsville Road) – Granite City, Fairmont City	Signed as 4A (south) and 4B (north) westbound
Madison	Nameoki Township			6	IL 111 / Great River Road – Wood River, Washington Park
				9	Black Lane	Eastbound exit and westbound entrance
	Collinsville Township			10	I-255 / Interstate 270 – Memphis	I-255 exit 25
				11	IL 157 (Bluff Road) – Collinsville, Edwardsville
	Maryville			15	IL 159 (Vandalia Street/Maryville Road) – Collinsville, Maryville	Signed as exits 15A (south) and 15B (north)
	Troy			17	US 40 – St. Jacob, Highland	Eastern end of US 40 concurrency
				18	IL 162 (Edwardsville Road) – Troy
	Pin Oak Township	19.0	30.6	—	I-55 north – Chicago, Springfield	Eastern end of I-55 concurrency; I-55 exit 20A; eastbound exit and westbound entrance
				—	I-270 west – Kansas City	Eastern terminus of I-270; westbound exit and eastbound entrance
	Marine Township			21	IL 4 – Staunton, Lebanon
				24	IL 143 – Marine, Highland
	Saline Township			30	US 40 west / IL 143 (Steiner Road) – Pierron, Highland	Western end of US 40 concurrency
Bond	Old Ripley Township			36	US 40 east (Pokey Road) – Pocahontas	Eastern end of US 40 concurrency
	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	Western end of I-57 concurrency; I-57 exit 157
	Effingham			159	Fayette Avenue – Effingham	Exits use I-57 exit numbers
				160	IL 32 / IL 33 (Keller Drive)
				162	US 45 (Third Street) – Sigel
	Teutopolis Township			98	I-57 north – Chicago	Eastern end of I-57 concurrency; I-57 exit 163
	Montrose			105	Spring Creek Road – Montrose
Cumberland	Greenup			119	IL 130 (Haughton Highway) – Greenup, Charleston
Clark	Casey Township			129	IL 49 – Casey, Kansas
	Martinsville			136	Cleone Road – Martinsville
	Marshall Township			147	IL 1 – Marshall, Paris
	Wabash Township			154	US 40 west	Western end of US 40 concurrency
					I-70 / US 40 east – Terre Haute, Indianapolis	Continuation into Indiana
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

Auxiliary routes

I-70 has one auxiliary route in Illinois:

• I-270 - Forms the northern and western two-thirds of the beltway around the St. Louis Metro Area (the eastern third is signed as I-255)

References

Route map: Google

Interstate 70
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