US Bridges

S Orange ST over Clark Fork River

Fair

Missoula County, Montana · Missoula-S Orange ST · Structure no. U08107001+05401

Built
2003
22 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
497 ft
4 main spans
Daily traffic
22,608
2023 count
Owner
State
State Highway Agency

About this bridge

S Orange ST over Clark Fork River is a prestressed concrete continuous stringer/multi-beam or girder carrying S Orange ST over Clark Fork River in Missoula County, Montana. It was built in 2003, so it is 22 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 22,608 vehicles a day, projected to reach 23,738 by 2043. The structure is 497 ft (151.4 m) long and 78 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS Orange ST
CrossesClark Fork River
LocationMissoula-S Orange ST
RouteCity Street 130
CountyMissoula County
StateMontana
Coordinates46.87155, -114.00068
Functional classUrban Other Principal Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32 US tons
Inventory rating22 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length497 ft (151.4 m)
Longest span164 ft (50 m)
Deck width78 ft (23.8 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,608 (2023)
Projected traffic23,738 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 S Orange ST over Clark Fork River built?

It was built in 2003, making it 22 years old in 2025.

What condition is S Orange ST over Clark Fork River 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 July 2024.

How much traffic does S Orange ST over Clark Fork River carry?

About 22,608 vehicles per day (2023 count).

How long is S Orange ST over Clark Fork River?

The structure is 497 ft (151.4 m) long with a longest span of 164 ft (50 m) and a deck 78 ft wide.

Who owns S Orange ST over Clark Fork River?

It is owned by the State Highway Agency.