US Bridges

I 90 EB over Clark Fork Rvr-Local RD

Fair

Mineral County, Montana · 6.2M E St. Regis · Structure no. I00090039+08051

Built
1982
43 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Steel Continuous
Length
1,283 ft
8 main spans
Daily traffic
3,559
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 EB over Clark Fork Rvr-Local RD is a steel continuous box beam or girders - multiple carrying I 90 EB over Clark Fork Rvr-Local RD in Mineral County, Montana. It was built in 1982, so it is 43 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 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 3,559 vehicles a day, roughly 28% of them trucks, projected to reach 3,736 by 2043. The structure is 1,283 ft (391 m) long and 44 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesI 90 EB
CrossesClark Fork Rvr-Local RD
Location6.2M E St. Regis
RouteInterstate 90
CountyMineral County
StateMontana
Coordinates47.2326, -115.0177
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating31 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length1,283 ft (391 m)
Longest span176 ft (53.6 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,559 (2023)
Projected traffic3,736 by 2043
Trucks28%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed123.7 mi (199 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90 EB over Clark Fork Rvr-Local RD built?

It was built in 1982, making it 43 years old in 2025.

What condition is I 90 EB over Clark Fork Rvr-Local RD 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 June 2023.

How much traffic does I 90 EB over Clark Fork Rvr-Local RD carry?

About 3,559 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I 90 EB over Clark Fork Rvr-Local RD?

The structure is 1,283 ft (391 m) long with a longest span of 176 ft (53.6 m) and a deck 44 ft wide.

Who owns I 90 EB over Clark Fork Rvr-Local RD?

It is owned by the State Highway Agency.