US Bridges

I 90 over Sep Juniper Dr-Clark Fk

Fair

Missoula County, Montana · 1.2M W Bonner · Structure no. I00090109+04092

Built
1965
60 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
409 ft
2 main spans
Daily traffic
10,294
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Sep Juniper Dr-Clark Fk is a steel continuous stringer/multi-beam or girder carrying I 90 over Sep Juniper Dr-Clark Fk in Missoula County, Montana. It was built in 1965, so it is 60 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 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 10,294 vehicles a day, roughly 11% of them trucks, projected to reach 10,808 by 2043. The structure is 409 ft (124.8 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
CrossesSep Juniper Dr-Clark Fk
Location1.2M W Bonner
RouteInterstate 90
CountyMissoula County
StateMontana
Coordinates46.87833, -113.90966
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+3 approach)
Design loadHS 20
Structure length409 ft (124.8 m)
Longest span126 ft (38.3 m)
Deck width32 ft (9.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,294 (2023)
Projected traffic10,808 by 2043
Trucks11%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90 over Sep Juniper Dr-Clark Fk built?

It was built in 1965, making it 60 years old in 2025.

What condition is I 90 over Sep Juniper Dr-Clark Fk 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 April 2024.

How much traffic does I 90 over Sep Juniper Dr-Clark Fk carry?

About 10,294 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I 90 over Sep Juniper Dr-Clark Fk?

The structure is 409 ft (124.8 m) long with a longest span of 126 ft (38.3 m) and a deck 32 ft wide.

Who owns I 90 over Sep Juniper Dr-Clark Fk?

It is owned by the State Highway Agency.