US Bridges

I 90 over Stc 5766;SILVERTON Ic

Fair

Shoshone County, Idaho · 2.2 W. Wallace · Structure no. 000000000017220

Built
1978
47 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
147 ft
3 main spans
Daily traffic
11,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 90 over Stc 5766;SILVERTON Ic is a prestressed concrete continuous box beam or girders - multiple carrying I 90 over Stc 5766;SILVERTON Ic in Shoshone County, Idaho. It was built in 1978, so it is 47 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 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 11,000 vehicles a day, roughly 36% of them trucks, projected to reach 16,500 by 2042. The structure is 147 ft (44.8 m) long and 82 ft wide.

Location

Open in Google Maps
CarriesI 90
CrossesStc 5766;SILVERTON Ic
Location2.2 W. Wallace
RouteInterstate 90
CountyShoshone County
StateIdaho
Coordinates47.49195, -115.95511
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating19 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length147 ft (44.8 m)
Longest span80 ft (24.4 m)
Deck width82 ft (24.9 m)
Roadway width79 ft (24 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2023)
Projected traffic16,500 by 2042
Trucks36%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$2.4 million (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 90 over Stc 5766;SILVERTON Ic built?

It was built in 1978, making it 47 years old in 2025.

What condition is I 90 over Stc 5766;SILVERTON Ic 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 June 2024.

How much traffic does I 90 over Stc 5766;SILVERTON Ic carry?

About 11,000 vehicles per day (2023 count), of which roughly 36% are trucks.

How long is I 90 over Stc 5766;SILVERTON Ic?

The structure is 147 ft (44.8 m) long with a longest span of 80 ft (24.4 m) and a deck 82 ft wide.

Who owns I 90 over Stc 5766;SILVERTON Ic?

It is owned by the State Highway Agency.