![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/9/90/I-255.svg/640px-I-255.svg.png&w=640&q=50)
Interstate 255
Highway in Illinois and Missouri / From Wikipedia, the free encyclopedia
Interstate 255 (I-255) is a bypass route of I-55 in Greater St. Louis. Along with I-270, it forms a loop around the central portion of the bi-state metro area; a majority of I-255 is located on the Illinois half. It shares its southern terminus with I-270 at the junction with I-55; I-270 and I-255 go to the west and east, respectively. U.S. Route 50 (US 50) joins I-255 at Lemay Ferry Road. It crosses the Mississippi River on the Jefferson Barracks Bridge, enters Illinois, and then turns northeast. There is a junction with I-64, where US 50 breaks off and goes east, and then further north there is a junction with I-55 again, I-70, and US 40, all of which are all cosigned together. The next junction is another one with I-270, which is the northern terminus of I-255. After that, the limited-access freeway continues on as Illinois Route 255 (IL 255). I-255 is 30.82 miles (49.60 km) in length.
I-255 highlighted in red | |||||||
Route information | |||||||
Auxiliary route of I-55 | |||||||
Maintained by IDOT and MoDOT | |||||||
Length | 30.82 mi[1] (49.60 km) | ||||||
Existed | 1986–present | ||||||
History | Completed by 1989[2] | ||||||
NHS | Entire route | ||||||
Major junctions | |||||||
West end | ![]() ![]() | ||||||
Major intersections |
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North end | ![]() ![]() | ||||||
Location | |||||||
Country | United States | ||||||
Counties | MO: St. Louis IL: Monroe, St. Clair, Madison | ||||||
Highway system | |||||||
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