Business Spur I-29 - Sioux Falls

Business Spur I-29 east at SD 115 in Downtown Sioux Falls — A set of overheads once directed traffic at the east end of Business Spur I-29, where 12th Street intersects Minnesota Avenue (SD 115). It was removed by 2006. The green out covering SD 38 on the pull through panel for Business Spur I-29 incorrectly displayed it as continuing. SD 38 was truncated northwest at the Sioux Falls city line, but it previously followed Russell Street southeast to West Avenue. It accompanied Business Spur I-29 east as part of replacement route for U.S. 16 east to I-229 and Cleveland Avenue. Photo by Bill Burmaster (2003).

Business Spur I-29/SR 42 east at SD 115 in Sioux Falls — The replacement assembly for the Downtown Spur I-29 east end added a shield for SD 115. This set of signs was short lived, as they were gone by 2008. SD 115 is a locally maintained route within the city of Sioux Falls. It was designated to replace U.S. 77 when it was decommissioned. Photo by Jeff Morrison (06/26/06).

Business Spur I-29/SD 42 provide a direct route to Downtown Sioux Falls along 12th Street (old U.S. 16) east to Menlo Avenue and the couplet of 10th and 11th Streets. The 2.5 mile long route concludes at Minnesota Avenue, where Business Spur I-90, Business Loop I-229 and SD 115 come together.

Downtown Sioux Falls is the only city with two Interstate business spurs and a business loop intersecting at the same place. Minnesota Avenue north leads to Sioux Falls Regional Airport (FSD) and I-90 as Business Spur I-90/SD 115. Business Spur I-229 turns from Minnesota Avenue (SD 115) and the All Saints neighborhood to the south of Downtown onto 10th / 11th Streets to the Whittier community east of the Big Sioux River.

All business routes within the city of Sioux Falls were transferred from SDDOT jurisdiction to city maintenance in 2006.² As South Dakota allows for locally maintained routes to be signed as state highways, the three business routes remain posted.

Many signs for Business Spur I-29 and the other two Interstate business routes in Sioux Falls display "Downtown" in place of Business. Also of note is that sometime after 1991, a loop ramp connected Grange Avenue north with 12th Street west by the one-way street separation of SD 42. A city park and the Obtuse, by sculptor Harry Klessen, are located at the site of the former roadway today.

Updated July 31, 2026