US Bridges

HWY 141 over Tualatin River

Fair

Washington County, Oregon · 4.0 MI N of HWY 1 · Structure no. 04970B141 00888

Built
1967
58 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
316 ft
3 main spans
Daily traffic
19,223
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 141 over Tualatin River is a prestressed concrete stringer/multi-beam or girder carrying HWY 141 over Tualatin River in Washington County, Oregon. It was built in 1967, so it is 58 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 19,223 vehicles a day, roughly 2% of them trucks, projected to reach 28,000 by 2042. The structure is 316 ft (96.3 m) long and 50 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesHWY 141
CrossesTualatin River
Location4.0 MI N of HWY 1
RouteState Highway 141
CountyWashington County
StateOregon
Coordinates45.38606, -122.75747
Functional classUrban Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length316 ft (96.3 m)
Longest span106 ft (32.2 m)
Deck width50 ft (15.2 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,223 (2022)
Projected traffic28,000 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was HWY 141 over Tualatin River built?

It was built in 1967, making it 58 years old in 2025.

What condition is HWY 141 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 December 2023.

How much traffic does HWY 141 over Tualatin River carry?

About 19,223 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is HWY 141 over Tualatin River?

The structure is 316 ft (96.3 m) long with a longest span of 106 ft (32.2 m) and a deck 50 ft wide.

Who owns HWY 141 over Tualatin River?

It is owned by the State Highway Agency.