US Bridges

HWY 29 over Tualatin River

Fair

Washington County, Oregon · 0.2 MI N Gaston Po · Structure no. 00810A029 02532

Built
1967
58 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
125 ft
3 main spans
Daily traffic
10,942
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 29 over Tualatin River is a prestressed concrete stringer/multi-beam or girder carrying HWY 29 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 10,942 vehicles a day, roughly 7% of them trucks, projected to reach 15,000 by 2042. The structure is 125 ft (38.1 m) long and 46 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesHWY 29
CrossesTualatin River
Location0.2 MI N Gaston Po
RouteState Highway 47
CountyWashington County
StateOregon
Coordinates45.43911, -123.1403
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length125 ft (38.1 m)
Longest span45 ft (13.7 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,942 (2022)
Projected traffic15,000 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 29 over Tualatin River built?

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

What condition is HWY 29 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 April 2024.

How much traffic does HWY 29 over Tualatin River carry?

About 10,942 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is HWY 29 over Tualatin River?

The structure is 125 ft (38.1 m) long with a longest span of 45 ft (13.7 m) and a deck 46 ft wide.

Who owns HWY 29 over Tualatin River?

It is owned by the State Highway Agency.