US Bridges

I-5 (hwy 1) over HWY 91 NB to HWY 1 NB

Fair

Multnomah County, Oregon · 1.5 MI S of Interstate Br · Structure no. 09015A001 30686

Built
1964
61 years old, rebuilt 1992
Condition
Fair
inspected December 2024
Type
Frame
Concrete
Length
29 ft
1 main span
Daily traffic
92,471
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) over HWY 91 NB to HWY 1 NB is a concrete frame carrying I-5 (hwy 1) over HWY 91 NB to HWY 1 NB in Multnomah County, Oregon. It was built in 1964 and reconstructed in 1992, so it is 61 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 92,471 vehicles a day, roughly 9% of them trucks, projected to reach 94,300 by 2042. The structure is 29 ft (8.9 m) long and 358 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 (hwy 1)
CrossesHWY 91 NB to HWY 1 NB
Location1.5 MI S of Interstate Br
RouteInterstate 5
CountyMultnomah County
StateOregon
Coordinates45.59736, -122.68443
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length29 ft (8.9 m)
Longest span26 ft (7.9 m)
Deck width358 ft (109.2 m)
Roadway width110 ft (33.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic92,471 (2022)
Projected traffic94,300 by 2042
Trucks9%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$149,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 (hwy 1) over HWY 91 NB to HWY 1 NB built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1992.

What condition is I-5 (hwy 1) over HWY 91 NB to HWY 1 NB 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 December 2024.

How much traffic does I-5 (hwy 1) over HWY 91 NB to HWY 1 NB carry?

About 92,471 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is I-5 (hwy 1) over HWY 91 NB to HWY 1 NB?

The structure is 29 ft (8.9 m) long with a longest span of 26 ft (7.9 m) and a deck 358 ft wide.

Who owns I-5 (hwy 1) over HWY 91 NB to HWY 1 NB?

It is owned by the State Highway Agency.