US Bridges

I 90 over Int Cyr-Clark Fork Rvr

Fair

Mineral County, Montana · 5M W Alberton · Structure no. I00090070+00901

Built
1981
44 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
781 ft
7 main spans
Daily traffic
4,585
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Int Cyr-Clark Fork Rvr is a steel continuous stringer/multi-beam or girder carrying I 90 over Int Cyr-Clark Fork Rvr in Mineral County, Montana. It was built in 1981, so it is 44 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 5 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 4,585 vehicles a day, roughly 20% of them trucks, projected to reach 4,814 by 2043. The structure is 781 ft (238 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI 90
CrossesInt Cyr-Clark Fork Rvr
Location5M W Alberton
RouteInterstate 90
CountyMineral County
StateMontana
Coordinates47.0041, -114.57843
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length781 ft (238 m)
Longest span168 ft (51.2 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,585 (2023)
Projected traffic4,814 by 2043
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and waterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90 over Int Cyr-Clark Fork Rvr built?

It was built in 1981, making it 44 years old in 2025.

What condition is I 90 over Int Cyr-Clark Fork Rvr 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 Int Cyr-Clark Fork Rvr carry?

About 4,585 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 90 over Int Cyr-Clark Fork Rvr?

The structure is 781 ft (238 m) long with a longest span of 168 ft (51.2 m) and a deck 44 ft wide.

Who owns I 90 over Int Cyr-Clark Fork Rvr?

It is owned by the State Highway Agency.