US Bridges

HWY 1W (steel Br) over Willamette River

Poor

Multnomah County, Oregon · 0.4 MI NE Portland Cc · Structure no. 06683 01WX00036

Built
1910
115 years old
Condition
Poor
inspected August 2023
Type
Truss - Thru
Steel
Length
785 ft
1 main span
Daily traffic
11,732
2022 count
Owner
Railroad
Railroad

About this bridge

HWY 1W (steel Br) over Willamette River is a steel truss - thru carrying HWY 1W (steel Br) over Willamette River in Multnomah County, Oregon. It was built in 1910, so it is 115 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 11,732 vehicles a day, roughly 10% of them trucks, projected to reach 12,300 by 2042. The structure is 785 ft (239.3 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesHWY 1W (steel Br)
CrossesWillamette River
Location0.4 MI NE Portland Cc
RouteState Highway 99
CountyMultnomah County
StateOregon
Coordinates45.52762, -122.66907
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating21.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length785 ft (239.3 m)
Longest span288 ft (87.8 m)
Deck width64 ft (19.5 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deck18 ft (5.4 m)

Traffic and service

Average daily traffic11,732 (2022)
Projected traffic12,300 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and railroad
CrossesRailroad and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerRailroad
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was HWY 1W (steel Br) over Willamette River built?

It was built in 1910, making it 115 years old in 2025.

What condition is HWY 1W (steel Br) over Willamette River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does HWY 1W (steel Br) over Willamette River carry?

About 11,732 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is HWY 1W (steel Br) over Willamette River?

The structure is 785 ft (239.3 m) long with a longest span of 288 ft (87.8 m) and a deck 64 ft wide.

Who owns HWY 1W (steel Br) over Willamette River?

It is owned by the Railroad and maintained by the State Highway Agency.