US Bridges

US 20 (hwy 31) EB over Willamette River

Fair

Benton County, Oregon · In Albany · Structure no. 01025D031 01044

Built
1925
100 years old, rebuilt 1971
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
1,090 ft
4 main spans
Daily traffic
16,759
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 (hwy 31) EB over Willamette River is a steel truss - thru carrying US 20 (hwy 31) EB over Willamette River in Benton County, Oregon. It was built in 1925 and reconstructed in 1971, so it is 100 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 5 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 16,759 vehicles a day, roughly 10% of them trucks, projected to reach 21,300 by 2042. The structure is 1,090 ft (332.2 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS 20 (hwy 31) EB
CrossesWillamette River
LocationIn Albany
RouteU.S. Route 20
CountyBenton County
StateOregon
Coordinates44.6391, -123.10662
Functional classUrban Other Principal 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.1 US tons
Inventory rating23.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans4 (+7 approach)
Design loadH 15
Structure length1,090 ft (332.2 m)
Longest span200 ft (61 m)
Deck width38 ft (11.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic16,759 (2022)
Projected traffic21,300 by 2042
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway, waterway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$5.6 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was US 20 (hwy 31) EB over Willamette River built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1971.

What condition is US 20 (hwy 31) EB over Willamette 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 July 2023.

How much traffic does US 20 (hwy 31) EB over Willamette River carry?

About 16,759 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is US 20 (hwy 31) EB over Willamette River?

The structure is 1,090 ft (332.2 m) long with a longest span of 200 ft (61 m) and a deck 38 ft wide.

Who owns US 20 (hwy 31) EB over Willamette River?

It is owned by the State Highway Agency.