Interstate 255

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For the former I-255 in Memphis, see Interstate 255 (Tennessee).

Interstate 255
Auxiliary route of the Interstate Highway System

Length:

30.82 mi^[1] (49.60 km)

Formed:

1967 (completed 1986)

South end:

I-55/I-270 in Mehlville, MO

Major
junctions:

I-64 in Washington Park, IL

I-70 in Collinsville, IL

North end:

I-270/IL 255 in Pontoon Beach, IL

Interstate 255 (abbreviated I-255) is a bypass route of Interstate 55 near St. Louis, Missouri and with Interstate 270, it forms a loop around the city. Even though St. Louis is in Missouri, a majority of the route runs through Illinois. It shares its southern terminus with 270 at the junction with Interstate 55, 270 goes to the west and 255 goes to the east. U.S. Route 50 is co-signed with both 270 and 255 here. It crosses the Mississippi River on the Jefferson Barracks Bridge, enters Illinois, and then turns north. There is a junction with Interstate 64, where US-50 breaks off and goes east, and then further north there is a junction with Interstate 55 again, Interstate 70, and U.S. Route 40, all of which are all co-signed together. The next junction is another one with Interstate 270, and it is the northern terminus of Interstate 255. After that, it becomes Illinois Route 255.

Interstate 255 is 30.82 miles in length.^[1]

[edit] Route description

Major cities Bolded cities are officially-designated control cities for signs
Mehlville Columbia Dupo Cahokia Centreville E. St. Louis Collinsville Pontoon Beach Edwardsville

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Further information might be found on the talk page or at requests for expansion.

[edit] Exit list

This section contains a table that is missing mileposts for one or more junctions. Please help by adding the missing mileposts.

County	Location	#	Destinations	Notes
St. Louis			I-270 west – Kansas City	Continuation beyond I-55
		1	I-55 – St. Louis, Memphis	Southbound exit and northbound entrance; signed as exits 1A (south) and 1B (north)
		1D	US 61 / US 67 / US 50 west (Lemay Ferry Road, Lindbergh Boulevard)	South end of US 50 overlap
		2	Route 231 (Telegraph Road)
		3	Koch Road
Jefferson Barracks Bridge over the Mississippi River Missouri–Illinois state line
Monroe	Columbia	6	IL 3 south / GRR south – Columbia	South end of IL 3/GRR overlap
St. Clair	Dupo	9	Dupo
		10	IL 3 north (GRR north) – Cahokia, East St. Louis	North end of IL 3/GRR overlap
	Cahokia	13	IL 157 – Cahokia
		15	Mousette Lane
	Centreville	17	IL 15 (Missouri Avenue) – Belleville, East St. Louis	Signed as exits 17A (east) and 17B (west)
	Centreville	19	State Street – East St. Louis
	Washington Park	20	I-64 / US 50 east – St. Louis, Louisville	North end of US 50 overlap
Madison	Collinsville	24	Collinsville Road
	Collinsville	25	I-55 / I-70 (US 40) – Indianapolis, Chicago, St. Louis	Signed as exits 25A (north/east) and 25B (south/west)
		26	Horseshoe Lake Road
	Pontoon Beach	29	IL 162 – Granite City, Glen Carbon
		30	I-270 – Indianapolis, Kansas City	Northbound exit and southbound entrance
			IL 255 – Wood River	Continuation beyond I-270