US Bridges

I 90B Loop over S.Fk.Coeur Dalene River

Fair

Shoshone County, Idaho · In Mullan · Structure no. 000000000017370

Built
1963
62 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
46 ft
1 main span
Daily traffic
1,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 90B Loop over S.Fk.Coeur Dalene River is a concrete tee beam carrying I 90B Loop over S.Fk.Coeur Dalene River in Shoshone County, Idaho. It was built in 1963, so it is 62 years old, older than the Idaho average of 45.3 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 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,500 by 2042. The structure is 46 ft (14 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesI 90B Loop
CrossesS.Fk.Coeur Dalene River
LocationIn Mullan
RouteInterstate 90
CountyShoshone County
StateIdaho
Coordinates47.46722, -115.80142
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
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 geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47 US tons
Inventory rating28 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length46 ft (14 m)
Longest span46 ft (14 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2023)
Projected traffic1,500 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$855,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90B Loop over S.Fk.Coeur Dalene River built?

It was built in 1963, making it 62 years old in 2025.

What condition is I 90B Loop over S.Fk.Coeur Dalene 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 September 2023.

How much traffic does I 90B Loop over S.Fk.Coeur Dalene River carry?

About 1,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is I 90B Loop over S.Fk.Coeur Dalene River?

The structure is 46 ft (14 m) long with a longest span of 46 ft (14 m) and a deck 42 ft wide.

Who owns I 90B Loop over S.Fk.Coeur Dalene River?

It is owned by the State Highway Agency.