US Bridges

I-5 (hwy 001) SB over Fremont Viaduct

Fair

Multnomah County, Oregon · 1.5 MI N of Burnside Br · Structure no. S8958A001 30299

Built
1963
62 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
2,012 ft
5 main spans
Daily traffic
55,340
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 001) SB over Fremont Viaduct is a steel stringer/multi-beam or girder carrying I-5 (hwy 001) SB over Fremont Viaduct in Multnomah County, Oregon. It was built in 1963, so it is 62 years old, older 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 55,340 vehicles a day, roughly 8% of them trucks, projected to reach 58,100 by 2042. The structure is 2,012 ft (613.3 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5 (hwy 001) SB
CrossesFremont Viaduct
Location1.5 MI N of Burnside Br
RouteInterstate 5
CountyMultnomah County
StateOregon
Coordinates45.54284, -122.67411
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 inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5 (+21 approach)
Design loadHS 20
Structure length2,012 ft (613.3 m)
Longest span140 ft (42.7 m)
Deck width38 ft (11.5 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic55,340 (2022)
Projected traffic58,100 by 2042
Trucks8%
Lanes on structure2
Traffic directionOne-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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$13.4 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 (hwy 001) SB over Fremont Viaduct built?

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

What condition is I-5 (hwy 001) SB over Fremont Viaduct 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 February 2025.

How much traffic does I-5 (hwy 001) SB over Fremont Viaduct carry?

About 55,340 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is I-5 (hwy 001) SB over Fremont Viaduct?

The structure is 2,012 ft (613.3 m) long with a longest span of 140 ft (42.7 m) and a deck 38 ft wide.

Who owns I-5 (hwy 001) SB over Fremont Viaduct?

It is owned by the State Highway Agency.