US Bridges

I-5 (hwy 001) over Tualatin River

Fair

Washington County, Oregon · At Tualatin River · Structure no. 02376B001 28951

Built
1975
50 years old, rebuilt 1991
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
260 ft
3 main spans
Daily traffic
156,016
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 001) over Tualatin River is a prestressed concrete stringer/multi-beam or girder carrying I-5 (hwy 001) over Tualatin River in Washington County, Oregon. It was built in 1975 and reconstructed in 1991, so it is 50 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 156,016 vehicles a day, roughly 9% of them trucks, projected to reach 183,500 by 2042. The structure is 260 ft (79.2 m) long and 160 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-5 (hwy 001)
CrossesTualatin River
LocationAt Tualatin River
RouteInterstate 5
CountyWashington County
StateOregon
Coordinates45.38759, -122.75066
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length260 ft (79.2 m)
Longest span100 ft (30.5 m)
Deck width160 ft (48.7 m)
Roadway width155 ft (47.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic156,016 (2022)
Projected traffic183,500 by 2042
Trucks9%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-5 (hwy 001) over Tualatin River built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1991.

What condition is I-5 (hwy 001) over Tualatin 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 January 2024.

How much traffic does I-5 (hwy 001) over Tualatin River carry?

About 156,016 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is I-5 (hwy 001) over Tualatin River?

The structure is 260 ft (79.2 m) long with a longest span of 100 ft (30.5 m) and a deck 160 ft wide.

Who owns I-5 (hwy 001) over Tualatin River?

It is owned by the State Highway Agency.