US Bridges

HWY 001 NB over Columbia River

Fair

Multnomah County, Oregon · At Interstate Bridge · Structure no. 01377A001 30838

Built
1916
109 years old, rebuilt 1958
Condition
Fair
inspected May 2024
Type
Movable - Lift
Steel
Length
3,538 ft
1 main span
Daily traffic
65,013
2022 count
Owner
State
State Highway Agency

About this bridge

HWY 001 NB over Columbia River is a steel movable - lift carrying HWY 001 NB over Columbia River in Multnomah County, Oregon. It was built in 1916 and reconstructed in 1958, so it is 109 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 65,013 vehicles a day, roughly 9% of them trucks, projected to reach 65,600 by 2042. The structure is 3,538 ft (1,078.4 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesHWY 001 NB
CrossesColumbia River
LocationAt Interstate Bridge
RouteInterstate 5
CountyMultnomah County
StateOregon
Coordinates45.61804, -122.67527
Functional classUrban Principal Arterial - Interstate

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 protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be 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 rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+16 approach)
Design loadH 15
Structure length3,538 ft (1,078.4 m)
Longest span279 ft (85 m)
Deck width45 ft (13.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic65,013 (2022)
Projected traffic65,600 by 2042
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$26.6 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was HWY 001 NB over Columbia River built?

It was built in 1916, making it 109 years old in 2025. It was reconstructed in 1958.

What condition is HWY 001 NB over Columbia 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 May 2024.

How much traffic does HWY 001 NB over Columbia River carry?

About 65,013 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is HWY 001 NB over Columbia River?

The structure is 3,538 ft (1,078.4 m) long with a longest span of 279 ft (85 m) and a deck 45 ft wide.

Who owns HWY 001 NB over Columbia River?

It is owned by the State Highway Agency.