Interstate 255

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.

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

Interstate 255

I-255 highlighted in red
Route information
Auxiliary route of I-55
Maintained by IDOT and MoDOT
Length30.82 mi (49.60 km)
Existed1986–present
HistoryCompleted by 1989
NHSEntire route
Major junctions
West end I-55 / I-270 in Mehlville, MO
Major intersections
North end I-270 / IL 255 in Pontoon Beach, IL
Location
CountryUnited States
CountiesMO: St. Louis
IL: Monroe, St. Clair, Madison
Highway system
  • Main
  • Auxiliary
  • Suffixed
  • Business
  • Future
  • Missouri State Highway System
  • Interstate
  • US
  • State
  • Supplemental
← Route 254MO→ Route 265
← IL 251IL→ IL 255
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