Business Loop I-90 - Alberton
The Alberton Business Loop for Interstate 90 was established by 2006 alongside Montana Secondary Highway 507. The business route follows Old U.S. 10 along Railroad Avenue 1.02 miles east from Exit 75 to Adams Street. The original alignment of U.S. 10 continues along Railroad Avenue and County Route 8 to Soudan north of the Clark Fork river. Business Loop I-90/S-507 return to Interstate 90 along Adams Street 1.51 miles east to Exit 77.
East
Business Loop I-90/S-507 begin east at the diamond interchange (Exit 75) joining Interstate 90 with Railroad Avenue on the west side of Alberton.
07/18/23
Railroad Avenue stems east from the S Frontage Road along Interstate 90 and the Clark Fork river. I-90 was built directly over Old U.S. 10 west out of Alberton.
07/18/23
A reassurance marker for Business Loop I-90 appears along Railroad Avenue east of Parkway Drive.
07/18/23
Railroad Avenue continues east into the town of Alberton.
07/18/23
Railroad Avenue east at 7th Street in the Alberton business district.
07/18/23
Date stamped from 1985, a trailblazer for I-90 stands just beyond the transition of Business Loop I-90/S-507 east onto Adams Street from Railroad Avenue (Old U.S. 10).
07/18/23
Adams Street advances east by The Meadows at Thompson Ranch subdivision developed in 2024/25.
07/18/23
Kirchey Creek Drive returns to Business Loop I-90/S-507 (Adams Street) east at this trailblazer for Interstate 90.
07/18/23
Adams Street runs along the north side of I-90 from ahead of the westbound freeway entrance ramp to Petty Creek Road.
07/18/23
Business Loop I-90/S-507 end south on Petty Creek Road at the eastbound entrance ramp to Missoula.
07/18/23
Petty Creek Road spans the Clark Fork river south beyond Interstate 90 to Lothrop.
07/18/23
West
Petty Creek Road spans the Clark Fork river north from Lothrop to Interstate 90 at Exit 77.
09/01/06
Terrace View Drive west ties into Petty Creek Road adjacent to the diamond interchange (Exit 77) where Business Loop I-90 west begins.
07/18/23
Petty Creek Road north at the eastbound entrance ramp for Interstate 90 to Missoula.
09/01/06
07/18/23
Business Loop I-90 and Montana Secondary Highway 507 overlap 2.33 miles west from I-90 at Exit 77 to Exit 75. This shield assembly was formerly posted where Petty Creek Road turns west at Exit 77.
09/01/06
Petty Creek Road continues a half mile east from the intersection where this trailblazer for I-90 west stands to Old U.S. 10 along County Route 8.
07/18/23
The westbound entrance ramp for Interstate 90 departs just beyond the Mineral County line from Business Loop I-90/S-507.
07/18/23
The lone westbound shield assembly for Business Loop I-90 west at Alberton stands at the on-ramp to Coeur d'Alene east of Kirchey Creek.
07/18/23
09/01/06
Business Loop I-90/S-507 follow Adams Street west into the Alberton town limits.
07/18/23
Business Loop I-90/S-507 overtake Railroad Avenue (Old U.S. 10) west from Adams Street.
07/18/23
Railroad Avenue (old U.S. 10) west at 7th Street in the Alberton business district.
07/18/23
A service station and a few eateries round out the services available along Business loop I-90 (Railroad Avenue) through Alberton.
09/01/06
Railroad Avenue west at 3rd Street in Alberton.
07/18/23
Business Loop I-90/S-507 lower from Alberton to the diamond interchange at Exit 75.
07/18/23
Old U.S. 10 (N Frontage Road) splits from the westbound entrance ramp to run along the north side of I-90 to the Mountain Creek area.
07/18/23
S-507 concludes along with Business Loop I-90 at the ramps for Coeur d'Alene and Missoula. Railroad Avenue ends at S Frontage Road, which leads west to the Natural Pier Bridge and fishing area, just beyond the eastbound entrance ramp.
07/18/23
Photo Credits:
- Brent Ivy: 07/18/23
- AARoads, Chris Kalina: 09/01/06
Connect with:
Page Updated Wednesday January 28, 2026.