Interstate 229 (Missouri)

Interstate 229
I-229 highlighted in red
Route information
Auxiliary route of I-29
Maintained by MoDOT
Length	15.027 mi[1] (24.184 km)
Existed	1986–present
NHS	Entire route
Major junctions
South end	I-29 / US 71 in St. Joseph
Major intersections	US 59 in St. Joseph US 36 in St. Joseph
North end	I-29 / US 59 / US 71 near St. Joseph
Location
Country	United States
State	Missouri
Counties	Buchanan, Andrew
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Missouri State Highway System Interstate US State Supplemental
← Route 224 → Route 231

Interstate 229 (I-229) is a 15-mile-long (24 km) auxiliary Interstate Highway that runs through St. Joseph, Missouri. It begins southeast of the city at I-29 and U.S. Route 71 (US 71) and travels to the northwest into the city. In St. Joseph, it runs with US 59. Just north of an interchange with US 36, the two routes travel over a one-mile-long (1.6 km) viaduct on the banks of the Missouri River. The two routes split at the north end of the viaduct. The Interstate ends at another interchange with I-29 and US 71 north of St. Joseph.

The portion that goes through downtown St. Joseph is the second double-decked bridge in the state of Missouri, the other on I-64 in St. Louis, and one of only a few such bridges in the United States and the world.^[2]

The Interstate was built in the late 1970s and early 1980s and was intended to draw people into St. Joseph's downtown area. A portion of the historic Robidoux Row, an area of St. Joseph built by the towns founder, was demolished to make way for the viaduct along the Missouri River.