Interstate 229 South Dakota
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.
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.
Source: December 31, 2021 Interstate Route Log and Finders List
I-229 Annual Average Daily Traffic (AADT)
Source: 2019 South Dakota Traffic Flow Map, South Dakota Department of Transportation (SDDOT).
Until 1962, the alignment of I-29 through Sioux Falls was proposed to extend north from where I-229 travels now to Millbank. This took Interstate 29 east of what was U.S. 77 to Tunerville.
Construction completed by November 16, 2016 at the south end of I-229 replaced the I-29 overpasses and realigned the loop ramp from I-29 south to I-229 north. This was part of an I-29 expansion project between Exit 73 near Tea and the 57th Street overpass in Sioux Falls. Phase 1 of the project was completed by late July 2016. Phase 2 followed with the replacement of both the northbound span on I-29 at I-229 and the ramp from I-29 south to I-229 north.1
Construction on I-29 north at I-229 in Sioux Falls #southdakota All traffic using the southbound side. #roads pic.twitter.com/cSE1aQehRl
— AARoads (@AARoads) August 6, 2016
North End – Sioux Falls, SD
North End Throwback
South End – Sioux Falls, South Dakota
Traffic partitions for Exit 1B back into Sioux Falls and the Exit 1A mainline connection to I-29 south to Sioux City, Iowa. 02/21/20
South End Throwback
- The South Dakota Highways Page: Highways 201 to 1806.
Page updated July 1, 2022.