US Bridges

I 15 over RR (tracks Not in Use)

Fair

Silver Bow County, Montana · Butte · Structure no. I00015130+00262

Built
1966
59 years old, rebuilt 2000
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
231 ft
1 main span
Daily traffic
2,176
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 over RR (tracks Not in Use) is a steel stringer/multi-beam or girder carrying I 15 over RR (tracks Not in Use) in Silver Bow County, Montana. It was built in 1966 and reconstructed in 2000, so it is 59 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 2,176 vehicles a day, roughly 12% of them trucks, projected to reach 2,350 by 2043. The structure is 231 ft (70.4 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesI 15
CrossesRR (tracks Not in Use)
LocationButte
RouteInterstate 15
CountySilver Bow County
StateMontana
Coordinates45.98737, -112.47687
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+3 approach)
Design loadHS 20
Structure length231 ft (70.4 m)
Longest span77 ft (23.5 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,176 (2023)
Projected traffic2,350 by 2043
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 over RR (tracks Not in Use) built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 2000.

What condition is I 15 over RR (tracks Not in Use) 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 June 2024.

How much traffic does I 15 over RR (tracks Not in Use) carry?

About 2,176 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is I 15 over RR (tracks Not in Use)?

The structure is 231 ft (70.4 m) long with a longest span of 77 ft (23.5 m) and a deck 47 ft wide.

Who owns I 15 over RR (tracks Not in Use)?

It is owned by the State Highway Agency.