US Bridges

I 90 WB over RR

Fair

Mineral County, Montana · 9.3M E Superior · Structure no. I00090057+04722

Built
1967
58 years old, rebuilt 2012
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
313 ft
5 main spans
Daily traffic
3,825
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 WB over RR is a prestressed concrete stringer/multi-beam or girder carrying I 90 WB over RR in Mineral County, Montana. It was built in 1967 and reconstructed in 2012, so it is 58 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 3,825 vehicles a day, roughly 24% of them trucks, projected to reach 4,015 by 2043. The structure is 313 ft (95.4 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 90 WB
CrossesRR
Location9.3M E Superior
RouteInterstate 90
CountyMineral County
StateMontana
Coordinates47.08136, -114.77369
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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length313 ft (95.4 m)
Longest span81 ft (24.7 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,825 (2023)
Projected traffic4,015 by 2043
Trucks24%
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$721,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 WB over RR built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2012.

What condition is I 90 WB 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 November 2023.

How much traffic does I 90 WB over RR carry?

About 3,825 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is I 90 WB over RR?

The structure is 313 ft (95.4 m) long with a longest span of 81 ft (24.7 m) and a deck 32 ft wide.

Who owns I 90 WB over RR?

It is owned by the State Highway Agency.