US Bridges

Old Tv HWY #47 over Tualatin River

Fair

Washington County, Oregon · 002 W New HWY # 47 · Structure no. 671407C02902590

Built
1921
104 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete
Length
120 ft
3 main spans
Daily traffic
576
2020 count
Owner
County
County Highway Agency

About this bridge

Old Tv HWY #47 over Tualatin River is a concrete tee beam carrying Old Tv HWY #47 over Tualatin River in Washington County, Oregon. It was built in 1921, so it is 104 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 576 vehicles a day, roughly 5% of them trucks, projected to reach 651 by 2025. The structure is 120 ft (36.6 m) long and 23 ft wide.

Location

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CarriesOld Tv HWY #47
CrossesTualatin River
Location002 W New HWY # 47
RouteCounty Highway C1204
CountyWashington County
StateOregon
Coordinates45.43892, -123.14107
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating27.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span50 ft (15.2 m)
Deck width23 ft (6.9 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic576 (2020)
Projected traffic651 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$615,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Tv HWY #47 over Tualatin River built?

It was built in 1921, making it 104 years old in 2025.

What condition is Old Tv HWY #47 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 September 2024.

How much traffic does Old Tv HWY #47 over Tualatin River carry?

About 576 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Old Tv HWY #47 over Tualatin River?

The structure is 120 ft (36.6 m) long with a longest span of 50 ft (15.2 m) and a deck 23 ft wide.

Who owns Old Tv HWY #47 over Tualatin River?

It is owned by the County Highway Agency.