US Bridges

I 15 over Local-Creek-Rarus RR

Fair

Silver Bow County, Montana · 1.2M W Rocker · Structure no. I00015120+06971

Built
1961
64 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
613 ft
1 main span
Daily traffic
3,728
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 over Local-Creek-Rarus RR is a steel stringer/multi-beam or girder carrying I 15 over Local-Creek-Rarus RR in Silver Bow County, Montana. It was built in 1961, so it is 64 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 3,728 vehicles a day, roughly 12% of them trucks, projected to reach 4,026 by 2043. The structure is 613 ft (186.9 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 15
CrossesLocal-Creek-Rarus RR
Location1.2M W Rocker
RouteInterstate 15
CountySilver Bow County
StateMontana
Coordinates46.00391, -112.64371
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating33 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+10 approach)
Design loadHS 20
Structure length613 ft (186.9 m)
Longest span69 ft (20.9 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,728 (2023)
Projected traffic4,026 by 2043
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed1.2 mi (2 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
NavigationNo navigation control on waterway

Frequently asked questions

When was I 15 over Local-Creek-Rarus RR built?

It was built in 1961, making it 64 years old in 2025.

What condition is I 15 over Local-Creek-Rarus RR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

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

About 3,728 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is I 15 over Local-Creek-Rarus RR?

The structure is 613 ft (186.9 m) long with a longest span of 69 ft (20.9 m) and a deck 32 ft wide.

Who owns I 15 over Local-Creek-Rarus RR?

It is owned by the State Highway Agency.