Interstate 255

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Interstate 255
Auxiliary route of the Interstate Highway System

Length:

30.82 mi (49.60 km)

Formed:

1967 (To be complete 1986)

South end:

Interstates 55/270 in Mehlville, MO

Major
junctions:

Interstate 64 in Washington Park, IL

Interstate 70 in Collinsville, IL

North end:

Illinois Route 255 in Pontoon Beach, IL

ILL 251

ILL 255

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, 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]

1 Interchanges
- 1.1 Missouri
- 1.2 Illinois
2 Major Cities
3 References

[edit] Interchanges

The numbering scheme begins at Interstate 55; however, the numbering scheme continues in Illinois with mile marker 4 instead of restarting at mile marker 1. Otherwise, two consecutive exits (Koch Road and Illinois Route 3) would be consecutively numbered Exit 3, creating confusion among drivers.

[edit] Missouri

County	Location	#^[2]	Destinations	Notes
St. Louis	St. Louis	1B-C	Interstate 55
		1A	U.S. Route 61 and U.S. Route 67 — Lemay Ferry Road	eastbound there is also an Exit 1D for Lemay Ferry; this was an existing exit prior to the rebuild of the I-255/I-270/I-55 interchange; westbound at Exit 1A U.S. Route 50 exits onto Lindbergh Road
		2	Route 231 — Telegraph Road
		3	Koch Road

[edit] Illinois

County	Location	#^[2]	Destinations	Notes
Monroe	Columbia	6	Illinois Route 3 South	Illinois 3 multiplexes with I-255 and U.S. 50 traveling northbound.
St. Clair	Dupo	9	Main Street
	Falling Spring	10	Illinois Route 3 North	Illinois 3 multiplexes with I-255 and U.S. 50 traveling southbound.
	Cahokia	13	Illinois Route 157
	Cahokia	15	Moussette Lane	Exit to GCS Ballpark.
	Centreville	17A-B	Illinois Route 15 — New Missouri Avenue
	Centreville	19	State Street
	Washington Park	20	Interstate 64, U.S. Route 50 East — St. Louis, Missouri, Louisville	U.S. 50 West multiplexes with I-255 southbound.
Madison	Collinsville	24	Collinsville Road
		25A-B	Interstates 55/70, U.S. Route 40 — St. Louis, Missouri, Chicago, Indianapolis, Indiana
		26	Horseshoe Lake Road
	Pontoon Beach	29	Illinois Route 162
	Pontoon Beach	30A-B	Interstate 270 — Kansas City, Missouri, Indianapolis, Indiana Illinois Route 255 North — Alton	Northern terminus of I-255. Freeway continues northbound as Illinois Route 255.