US Bridges

I 15 over Local Rarus-Rr

Good

Silver Bow County, Montana · West of Butte · Structure no. 000000201901105

Built
2019
6 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
366 ft
3 main spans
Daily traffic
7,379
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 over Local Rarus-Rr is a steel continuous stringer/multi-beam or girder carrying I 15 over Local Rarus-Rr in Silver Bow County, Montana. It was built in 2019, so it is 6 years old, younger than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,379 vehicles a day, roughly 15% of them trucks, projected to reach 7,747 by 2043. The structure is 366 ft (111.6 m) long and 40 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI 15
CrossesLocal Rarus-Rr
LocationWest of Butte
RouteInterstate 15
CountySilver Bow County
StateMontana
Coordinates45.99931, -112.56548
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length366 ft (111.6 m)
Longest span139 ft (42.4 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic7,379 (2023)
Projected traffic7,747 by 2043
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 over Local Rarus-Rr built?

It was built in 2019, making it 6 years old in 2025.

What condition is I 15 over Local Rarus-Rr in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does I 15 over Local Rarus-Rr carry?

About 7,379 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is I 15 over Local Rarus-Rr?

The structure is 366 ft (111.6 m) long with a longest span of 139 ft (42.4 m) and a deck 40 ft wide.

Who owns I 15 over Local Rarus-Rr?

It is owned by the State Highway Agency.