US Bridges

I-5 (hwy 1) over Silverton Road

Fair

Marion County, Oregon · In Salem · Structure no. 17487 001 25753

Built
1999
26 years old
Condition
Fair
inspected December 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
154 ft
1 main span
Daily traffic
95,098
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) over Silverton Road is a prestressed concrete box beam or girders - single or spread carrying I-5 (hwy 1) over Silverton Road in Marion County, Oregon. It was built in 1999, so it is 26 years old, younger than the Oregon average of 49.9 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 95,098 vehicles a day, roughly 13% of them trucks, projected to reach 98,900 by 2042. The structure is 154 ft (46.9 m) long and 149 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 (hwy 1)
CrossesSilverton Road
LocationIn Salem
RouteInterstate 5
CountyMarion County
StateOregon
Coordinates44.96828, -122.99023
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating44.3 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length154 ft (46.9 m)
Longest span154 ft (46.9 m)
Deck width149 ft (45.3 m)
Roadway width120 ft (36.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95,098 (2022)
Projected traffic98,900 by 2042
Trucks13%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 (hwy 1) over Silverton Road built?

It was built in 1999, making it 26 years old in 2025.

What condition is I-5 (hwy 1) over Silverton Road 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 December 2023.

How much traffic does I-5 (hwy 1) over Silverton Road carry?

About 95,098 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is I-5 (hwy 1) over Silverton Road?

The structure is 154 ft (46.9 m) long with a longest span of 154 ft (46.9 m) and a deck 149 ft wide.

Who owns I-5 (hwy 1) over Silverton Road?

It is owned by the State Highway Agency.