US Bridges

I 90 over Int E Bozeman-P 50

Fair

Gallatin County, Montana · Bozeman · Structure no. I00090309+03702

Built
1971
54 years old, rebuilt 2005
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
206 ft
4 main spans
Daily traffic
9,819
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Int E Bozeman-P 50 is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int E Bozeman-P 50 in Gallatin County, Montana. It was built in 1971 and reconstructed in 2005, so it is 54 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 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 206 ft (62.8 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 90
CrossesInt E Bozeman-P 50
LocationBozeman
RouteInterstate 90
CountyGallatin County
StateMontana
Coordinates45.67522, -111.01035
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30 US tons
Inventory rating23 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length206 ft (62.8 m)
Longest span67 ft (20.4 m)
Deck width46 ft (14 m)
Roadway width43 ft (13.1 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
CarriesOverpass structure at an interchange
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 over Int E Bozeman-P 50 built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2005.

What condition is I 90 over Int E Bozeman-P 50 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 2024.

How much traffic does I 90 over Int E Bozeman-P 50 carry?

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

How long is I 90 over Int E Bozeman-P 50?

The structure is 206 ft (62.8 m) long with a longest span of 67 ft (20.4 m) and a deck 46 ft wide.

Who owns I 90 over Int E Bozeman-P 50?

It is owned by the State Highway Agency.