Business Loop I-90 - Rapid City

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Trailblazers for Business Loop I-90 west and Interstate 90 formerly posted along Main Street at West Boulevard in Rapid City, South Dakota. West Boulevard leads directly to Interstate 190 north while Main Street transitions to two-way traffic beyond nearby Halley Park. This shield assembly was replaced by 2011. 07/06/08

The longest Business Route for I-90, the Rapid City area route loops south from Exit 52 at Blackhawk to Exit 60 by Rushmore Crossing shopping center. Traveling 11.8 miles overall, Business Loop I-90 begins at the diamond interchange with Peaceful Pines Road, which it takes west to Sturgis Road (old U.S. 14/SD 79). This configuration replaced a direct off-ramp to Sturgis Road when I-90 was realigned at Blackhawk by 2009.

The Sturgis Road alignment south to Chicago Street in west Rapid City is state maintained and designated SD 231. The route is unmarked otherwise as it forms part of a truck route with SD 445 to SD 44 on Omaha Street. Business Loop I-90 parallels these routes to the south along locally maintained Main Street to SD 44 and Baken Park Shopping Center. The commercial arterial advances east to split into a couplet using St. Joseph Street (east) and Main Street (west) through Downtown Rapid City.

The one-way pair of Business Loop I-90 combines along East Boulevard as the route turns north to intersect SD 44 (Omaha Street) again and cross Rapid Creek. Arcing east, North Street comprises a four to five lane commercial boulevard carrying the business route back toward I-90. The loop concludes at a single point urban interchange in a growing retail area.

Possibly relating to the fact that the majority of the route is no longer state-maintained, many commercial mapping companies dropped Business Loop I-90 references from their Rapid City insets in the late 1990s. The loop however remained signed in the field as verified in September 2004, August 2014 and August 2016.

Business Loop I-90 Photo Guide
Updated August 1, 2026