Interstate 29 in South Dakota

Interstate 29 (I-29) is a north–south Interstate Highway in the midwestern United States. In the state of South Dakota, I-29 traverses on the eastern side of the state from the Iowa border near Sioux City to the North Dakota border near New Effington. On its route, I-29 passes through western portions of Sioux Falls, the state's largest city. It travels 252.5 miles (406.4 km) in the state, the longest stretch of any of the four states through which it passes. I-229, the highway's lone auxiliary route in South Dakota, serves as a bypass around southern and eastern Sioux Falls.

This article is about the section of Interstate 29 in South Dakota. For the entire route, see Interstate 29.

Interstate 29

I-29 highlighted in red
Route information
Maintained by SDDOT
Length252.50 mi (406.36 km)
NHSEntire route
Major junctions
South end I-29 at Iowa state line
Major intersections
  • US 18 concurrency near Canton
  • I-229 in Sioux Falls
  • I-90 near Sioux Falls
  • US 14 in Brookings
  • US 212 in Watertown
  • US 81 near Watertown
  • US 12 near Summit
North end I-29 / US 81 at North Dakota state line
Location
CountryUnited States
StateSouth Dakota
CountiesUnion, Lincoln, Minnehaha, Moody, Brookings, Deuel, Hamlin, Codington, Grant, Roberts
Highway system
  • Main
  • Auxiliary
  • Suffixed
  • Business
  • Future
  • South Dakota State Trunk Highway System
  • Interstate
  • US
  • State
← SD 28→ SD 30
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