US Bridges

I 90 over Int Orange Street

Good

Missoula County, Montana · Missoula · Structure no. I00090104+07802

Built
1966
59 years old
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
179 ft
3 main spans
Daily traffic
12,078
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Int Orange Street is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int Orange Street in Missoula County, Montana. It was built in 1966, 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 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 12,078 vehicles a day, roughly 10% of them trucks, projected to reach 12,863 by 2042. The structure is 179 ft (54.6 m) long and 38 ft wide.

CarriesI 90
CrossesInt Orange Street
LocationMissoula
RouteInterstate 90
StateMontana
Coordinates46.88036, -113.99262
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating19 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span72 ft (21.9 m)
Deck width38 ft (11.7 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,078 (2023)
Projected traffic12,863 by 2042
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 90 over Int Orange Street built?

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

What condition is I 90 over Int Orange Street 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 January 2025.

How much traffic does I 90 over Int Orange Street carry?

About 12,078 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I 90 over Int Orange Street?

The structure is 179 ft (54.6 m) long with a longest span of 72 ft (21.9 m) and a deck 38 ft wide.

Who owns I 90 over Int Orange Street?

It is owned by the State Highway Agency.