Interstate 229 in South Dakota is an urban loop serving the southern and eastern areas of metropolitan Sioux Falls. The freeway provides a cutoff between I-29 near Tea to the south and Interstate 90 near Brandon to the east. I-229 also serves commuting interests, providing a faster route to Downtown Sioux Falls than I-29 to the west.
Additionally, a 4.4 mile long Business Loop for I-229 provides a direct route to the Sioux Falls City center via Minnesota Avenue from the south and the couplet of E 10th and 11th Streets to the east. The business loop is maintained by the city and signed partially as “Downtown Loop I-229.”
The 26th Street Corridor Study evaluates proposed work to reconfigure the folded diamond interchange joining I-229 with E 26th Street and Yeager Road. Additional interchange improvements are considered as part of the I-229 Corridor Study.
Northward view of Interstate 229 at the exchanges with Rice Street, Benson Road and I-90 in Sioux Falls, SD. 08/13/16
Interstate 229 was completed by 1962.1 Per the 1962 USGS Quadrangle maps, the interchanges with Louise Avenue, E 26th Street and Benson Road were unbuilt. The south end interchange consisted of just a wye with no access from I-29 south to I-229 north or I-229 south to I-29 north.