US Bridges

I 90 over Int COLUMBUS-9th ST N

Fair

Stillwater County, Montana · Columbus · Structure no. I00090408+09032

Built
1971
54 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
141 ft
3 main spans
Daily traffic
6,161
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Int COLUMBUS-9th ST N is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int COLUMBUS-9th ST N in Stillwater County, Montana. It was built in 1971, 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 6,161 vehicles a day, roughly 20% of them trucks, projected to reach 6,715 by 2043. The structure is 141 ft (43 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesI 90
CrossesInt COLUMBUS-9th ST N
LocationColumbus
RouteInterstate 90
CountyStillwater County
StateMontana
Coordinates45.64701, -109.24777
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length141 ft (43 m)
Longest span77 ft (23.5 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,161 (2023)
Projected traffic6,715 by 2043
Trucks20%
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 COLUMBUS-9th ST N built?

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

What condition is I 90 over Int COLUMBUS-9th ST N 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 February 2024.

How much traffic does I 90 over Int COLUMBUS-9th ST N carry?

About 6,161 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 90 over Int COLUMBUS-9th ST N?

The structure is 141 ft (43 m) long with a longest span of 77 ft (23.5 m) and a deck 41 ft wide.

Who owns I 90 over Int COLUMBUS-9th ST N?

It is owned by the State Highway Agency.