Route Description
Interstate 129 begins along U.S. Route 20 on the western edge of South Sioux City, Nebraska, just west of exit 1, a cloverleaf interchange with U.S. Route 75 and U.S. Route 77. US 77 travels north through South Sioux City before ending at Interstate 29 in Sioux City while US 75 joins I-129 and US 20. One mile (1.6 km) later, I-129 / US 20 / US 75 intersect Dakota Avenue at a partial cloverleaf interchange. U.S. Route 20 Business is designated along Dakota Avenue.
East of Dakota Avenue, I-129 / US 20 / US 75 travels south of South Sioux City and passes through rolling farmland. For the rest of I-129's length, the two directions of I-129 / US 20 / US 75 traffic are separated by a Jersey barrier instead of a grassy median. The three routes cross the Missouri River and immediately intersect Interstate 29 at an interchange. Due to the minimum amount of space along the Missouri River banks, the I-29 interchange is a modified two-level cloverstack interchange. At I-29, US 20 and US 75 continue east around Sioux City and I-129 ends.
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