Business Loop I-15 - Helena

The capital city business loop for I-15 takes a convoluted 4.4 mile route west from Exits 192 to 193. Signs reference the route from the freeway mainline, but the route itself is poorly posted. U.S. 12 runs concurrent with Business Loop I-15 along a couplet of Prospect Avenue west and 11th Avenue east between a parclo interchange with I-15 and Montana Avenue. Trailblazers for U.S. 12 take the place of Business Loop I-15 shield along westbound while I-15 trailblazers are posted eastbound.

U.S. 12 turns north onto Montana Avenue and west along Lyndale Avenue to bypass the Helena city center. The business loop extends west along 11th Avenue through residential neighborhoods to Cruse Street and Last Chance Gulch at Downtown Helena. This stretch of the route is unmarked.

An array of trailblazers for both Interstate 15 and U.S. 12 stand at the five point intersection of Cruse Street, Helena Avenue, Neill Avenue and Last Chance Gulch. These assemblies direct traffic on Last Chance Gulch north and 11th Avenue east for Business Loop I-15 and 11th and Neill Avenues for U.S. 12 Business.

Last Chance Gulch leads northeast to become Cedar Street, a commercial arterial returning Business Loop I-15 to I-15 across from Helena Regional Airport (HLN). Erroneous trailblazers for Business Loop I-15 are posted along the route eastbound at both U.S. 12 (Lyndale Avenue) and Montana Street while U.S. 12 trailblazers line westbound.