US Bridges

I-5 (hwy 001) SB over Marquam Bridge Ramp

Fair

Multnomah County, Oregon · 0.8 MI S of Burnside Br · Structure no. 08590C001 30069

Built
1966
59 years old, rebuilt 1995
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
2,358 ft
13 main spans
Daily traffic
42,700
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 001) SB over Marquam Bridge Ramp is a steel stringer/multi-beam or girder carrying I-5 (hwy 001) SB over Marquam Bridge Ramp in Multnomah County, Oregon. It was built in 1966 and reconstructed in 1995, so it is 59 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 42,700 vehicles a day, roughly 10% of them trucks, projected to reach 45,300 by 2042. The structure is 2,358 ft (718.7 m) long and 62 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesI-5 (hwy 001) SB
CrossesMarquam Bridge Ramp
Location0.8 MI S of Burnside Br
RouteInterstate 5
CountyMultnomah County
StateOregon
Coordinates45.51244, -122.66798
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating17.2 US tons
Inventory rating13.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans13 (+9 approach)
Design loadHS 20
Structure length2,358 ft (718.7 m)
Longest span177 ft (53.9 m)
Deck width62 ft (18.9 m)
Roadway width57 ft (17.4 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic42,700 (2022)
Projected traffic45,300 by 2042
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed6.2 mi (10 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$24.4 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 (hwy 001) SB over Marquam Bridge Ramp built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1995.

What condition is I-5 (hwy 001) SB over Marquam Bridge Ramp 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 June 2023.

How much traffic does I-5 (hwy 001) SB over Marquam Bridge Ramp carry?

About 42,700 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is I-5 (hwy 001) SB over Marquam Bridge Ramp?

The structure is 2,358 ft (718.7 m) long with a longest span of 177 ft (53.9 m) and a deck 62 ft wide.

Who owns I-5 (hwy 001) SB over Marquam Bridge Ramp?

It is owned by the State Highway Agency.