US Bridges

I 90B Loop over South Fork Cda River

Fair

Shoshone County, Idaho · In Wallace · Structure no. 000000000017330

Built
1987
38 years old
Condition
Fair
inspected September 2021
Type
Slab
Concrete Continuous
Length
115 ft
3 main spans
Daily traffic
2,800
2023 count
Owner
State
State Highway Agency

About this bridge

I 90B Loop over South Fork Cda River is a concrete continuous slab carrying I 90B Loop over South Fork Cda River in Shoshone County, Idaho. It was built in 1987, so it is 38 years old, younger 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 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 2,800 vehicles a day, roughly 1% of them trucks, projected to reach 4,200 by 2042. The structure is 115 ft (35.1 m) long and 71 ft wide.

Location

Open in Google Maps
CarriesI 90B Loop
CrossesSouth Fork Cda River
LocationIn Wallace
RouteInterstate 90
CountyShoshone County
StateIdaho
Coordinates47.47704, -115.93327
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length115 ft (35.1 m)
Longest span43 ft (13.1 m)
Deck width71 ft (21.5 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2023)
Projected traffic4,200 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90B Loop over South Fork Cda River built?

It was built in 1987, making it 38 years old in 2025.

What condition is I 90B Loop over South Fork Cda 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 2021.

How much traffic does I 90B Loop over South Fork Cda River carry?

About 2,800 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is I 90B Loop over South Fork Cda River?

The structure is 115 ft (35.1 m) long with a longest span of 43 ft (13.1 m) and a deck 71 ft wide.

Who owns I 90B Loop over South Fork Cda River?

It is owned by the State Highway Agency.