US Bridges

I 90 over RR

Fair

Gallatin County, Montana · 4.3M E Bozeman · Structure no. I00090314+00831

Built
2006
19 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
427 ft
3 main spans
Daily traffic
9,819
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over RR is a steel continuous stringer/multi-beam or girder carrying I 90 over RR in Gallatin County, Montana. It was built in 2006, so it is 19 years old, younger 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 6 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 9,819 vehicles a day, roughly 13% of them trucks, projected to reach 10,702 by 2043. The structure is 427 ft (130 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 90
CrossesRR
Location4.3M E Bozeman
RouteInterstate 90
CountyGallatin County
StateMontana
Coordinates45.64726, -110.93569
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length427 ft (130 m)
Longest span180 ft (55 m)
Deck width39 ft (12 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,819 (2023)
Projected traffic10,702 by 2043
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$712,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 over RR built?

It was built in 2006, making it 19 years old in 2025.

What condition is I 90 over 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 May 2023.

How much traffic does I 90 over RR carry?

About 9,819 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is I 90 over RR?

The structure is 427 ft (130 m) long with a longest span of 180 ft (55 m) and a deck 39 ft wide.

Who owns I 90 over RR?

It is owned by the State Highway Agency.