One of the few 3-digit Interstate business routes in the system, Downtown Loop I-229 through Sioux Falls is a locally maintained route joining the city center with I-229 to the south and east. The 4.3 mile loop runs north along Minnesota Avenue (old U.S. 77) alongside SD 115 to the one-way couplet of 10th and 11th Streets in Downtown. There Business Spur I-29 west and Business Spur I-90 north begin as Downtown Loop I-229 turns east alongside SD 42. 10th and 11th Streets combine into a five-lane boulevard east of the viaducts over the BNSF Railroad and Big Sioux River through the Whittier neighborhood and back to Interstate 229.

Minnesota Avenue was signed as U.S. 77 until 1981, when the route was downgraded to SD 115 between U.S. 18 and Dell Rapids. The route through the city of Sioux Falls is locally maintained. U.S. 16 was truncated east of Sioux Falls in 1979 and decommissioned east of Rapid City the following year. SD 42 replaced the easternmost portion of the route. The highway is state maintained outside the Sioux Falls city limits.

Business Loop I-229 Guides

Business Loop I-229 scenes
2 photos
2 photos
Since removed, this sign bridge posted above 2nd Avenue supported button copy signs referencing SD 38 along Business Loop I-229. SD 38 used to follow old U.S. 16 through Sioux Falls, but was replaced in 1995 with an extended SD 42 when SD 38 was truncated to I-29.1 04/20/07
2nd Avenue north at Business Loop I-229/SD 42 west (10th Street) by Fawick Park. There are no signs posted for either route on 2nd Avenue now. 06/17/15

Photo Credits:

04/20/07, 06/17/15 by AARoads

Connect with:
Interstate 229
Highway 42

Page Updated 07-19-2016.

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