Business Loop I-90 - Laurel

Business Loop I-90 east at S-532/1st Ave in Downtown Laurel, MT — Business Loop I-90 (Main Street) east at S-532 and 1st Avenue in Downtown Laurel. U.S. 310 formerly began here, but now starts 0.4 miles to the south at I- 90 and U.S. 212. As of 2016, two shields still allude to the original end point. 08/08/16

This business route follows Main Street (old U.S. 10) east through Laurel from an access road linking it with I-90 at Exit 433 to Exit 437 east of the city line. Totaling 5.0 miles, Business Loop I-90 once intersected the north end of U.S. 310 at 1st Avenue in Downtown Laurel. The US route was truncated to its interchange (Exit 434) with I-90 and U.S. 212 just to the south by 2008. Several shields were observed along Main Street for the business route in 2016.

Updated August 1, 2026