US Bridges

I 90B over Placer Creek

Fair

Shoshone County, Idaho · In Wallace · Structure no. 000000000017245

Built
1942
83 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
21 ft
1 main span
Daily traffic
2,800
2023 count
Owner
State
State Highway Agency

About this bridge

I 90B over Placer Creek is a concrete culvert carrying I 90B over Placer Creek in Shoshone County, Idaho. It was built in 1942, so it is 83 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 2,800 vehicles a day, roughly 4% of them trucks, projected to reach 4,200 by 2042. The structure is 21 ft (6.4 m) long and 97 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 90B
CrossesPlacer Creek
LocationIn Wallace
RouteInterstate 90
CountyShoshone County
StateIdaho
Coordinates47.47564, -115.93006
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating32 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width97 ft (29.6 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2023)
Projected traffic4,200 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$395,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 90B over Placer Creek built?

It was built in 1942, making it 83 years old in 2025.

What condition is I 90B over Placer Creek 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 over Placer Creek carry?

About 2,800 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is I 90B over Placer Creek?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 97 ft wide.

Who owns I 90B over Placer Creek?

It is owned by the State Highway Agency.