Interstate 115 provides part of a direct route from I-15 east & I-90 north to Downtown Butte from a wye interchange (Exit 124) near Rocker. The 1.194 mile freeway spurs east to an exit with Excelsior Avenue before ending as Iron Street along a residential strip preceding Montana Street. Business Loop I-15 & I-90 overlap with the freeway to Montana Street north and the historic district of Butte.


Interstate 115 east & Business Loop I-15 north-90 east
Interstate 115 stems east from I-15 north & 90 east from a left-hand ramp (Exit 124). Photo taken 07/05/16.
The first set of shields for the three-way overlap of I-115 east, Business Loop I-15 north & I-90 east stands within the wye interchange at I-15 & 90. Photo taken 07/05/16.
Eastbound I-115 expands to two lanes ahead of the 1964-overpass above Interstate 15 south & 90 west. Photo taken 07/05/16.
The Silver Bow Creek valley spreads into view to the southeast as Interstate 115 approaches Exit 1 with Excelsior Avenue. Excelsior Avenue connects I-115 with public works areas of Butte and other industrial businesses to the south along Centennial Avenue. Photo taken 07/05/16.
Goldflint Mountain and other peaks rise along the Continental Divide along the east side of Butte as the carriageways of I-115 converge ahead of Exit 1. Excelsior Avenue north to Park Street leads drivers to the campus of Montana Tech. Photo taken 07/05/16.
Exit 1 departs from I-115 east & Business Loop I-15 & 90 for adjacent Excelsior Avenue. Excelsior Avenue north provides a direct route to Walkerville Drive and the town of Walkerville. Photo taken 07/05/16.
Speed limits quickly reduce to 35 miles per hour as I-115 passes over Excelsior Avenue. Photo taken 07/05/16.
A second confirming marker for I-115 appears after Excelsior Avenue, despite the speed limit reduction. Photo taken 07/05/16.
Interstate 115 ends as Business Loop I-15 north & 90 east transition onto Iron Street. Iron Street extends three blocks east to Montana Street (former U.S. 10 and U.S. 91). Photo taken 07/05/16.
Interstate 115 west & Business Loop I-15 south-90 west
On-street parking for residences along Iron Street gives way to a controlled access freeway beyond Clark Street. The first reassurance marker for Interstate 115 stands just west of the last house. Photo taken 07/07/16.
A concrete median separates the four lane freeway as I-115 enters a folded diamond interchange (Exit 1) with Excelsior Avenue. Photo taken 07/07/16.
Exit 1 loops away from Interstate 115 west for Excelsior Avenue. Excelsior Avenue travels through west Butte to the town of Walkerville. Photo taken 07/07/16.
The freeway carriageways diverge west from Exit 1 for the pending merge with Interstate 15 south & 90 west. Photo taken 07/07/16.
Trailblazers for I-15 & I-90 take the place of Business Loop shields again at the second and last confirming marker for Interstate 115. Photo taken 08/09/16.
Traffic along I-115 west reduces to a single lane ahead of the merge with I-15 south & 90 west at Whiskey Gulch. Photo taken 08/09/16.
The area terrain sees a carriageway separation along I-15 & 90 as well. The tandem continue west to Rocker and Nissler, where they part ways for Dillon and Missoula respectively. Photo taken 08/09/16.
Interstate 115 scenes
Excelsior Avenue curves northeast from Centennial Avenue to meet the lone interchange of Interstate 115 by Hamblin Heights mobile home park. Photo taken 08/09/16.
The westbound on-ramp for I-115 leads motorists onto Interstate 15 south & 90 west to Rocker and western outskirts of Butte. Photo taken 08/09/16.
Freeway entrance sign posted at the westbound on-ramp for Interstate 115. Despite being by the urban area of Butte, cattle guards are used here. Photo taken 08/09/16.
Excelsior Avenue lowers from the residential street grid of west Butte into a folded diamond interchange with Interstate 115. The westbound on-ramp references Dillon for I-15 south and Missoula for I-90 west. Photo taken 08/09/16.
The Interstate 115 overpass above Excelsior Avenue dates back to 1955. Photo taken 08/09/16.
Excelsior Avenue turns west and parallels I-115 at the eastbound on-ramp to Iron Street and Business Loop I-15 north & I-90 east. Excelsior Avenue continues west below Interstates 15 & 90 to become an unpaved road west toward Rocker. Photo taken 08/09/16.



Photo Credits:

07/05/16, 07/07/16, 08/09/16 by AARoads

Connect with:
Interstate 15
Interstate 90

Page Updated 01-12-2017.