Traveling 290 miles through the Magnolia State, Interstate 55 enters Mississippi in rural Pike County and exits it through Southhaven in suburban DeSoto County. Joining the state capital of Jackson with Memphis, Tennessee and the Greater New Orleans area in southeastern Louisiana, I-55 replaced U.S. 51. The mostly rural route connects a number of smaller cities including McComb, where it combines with U.S. 98, Brookhaven at U.S. 84, and Grenada.
The establishment of Interstate 69 in Tunica and DeSoto Counties in 2006 included a 9.2-mile overlap with I-55 to the Tennessee state line. The cloverleaf interchange where I-55 and I-69 combine was completed in October 2018, when the final section of Interstate 269 in northern Mississippi opened to traffic.
Through Jackson, Interstate 55 overlaps with I-20 across the Pearl River. The commuter freeway accommodate six lanes, with additional auxiliary lanes between interchanges. The suburban corridor extends northward along I-55 through Ridgeland, Madison and Canton.
Interstate 55 Mississippi Guides
Roadwork completed along Interstate 55 between the north end of I-220 and the Jackson suburb of Ridgeland included reconstruction of the diamond interchange (Exit 105B) with Old Agency Road into a partial cloverleaf. Work also expanded Old Agency Road to five lanes west from Sunnybrook Road to a multi-lane roundabout with Highland Colony Parkway. A 1.6 mile section of I-55, from I-220 (Exit 104) to Exit 105B, was also widened from four to six lanes. This included reconstructing the Natchez Trace Parkway overpass. Costing $16.8 million, the improvement project ran from February 2001 to May 2004.1