US Bridges

I-5 (hwy 1) NB over HWY 51 SB

Fair

Clackamas County, Oregon · 020 MI N Marion-Clack LN · Structure no. 20418 001 28225

Built
2007
18 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
90 ft
1 main span
Daily traffic
63,616
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 1) NB over HWY 51 SB is a prestressed concrete stringer/multi-beam or girder carrying I-5 (hwy 1) NB over HWY 51 SB in Clackamas County, Oregon. It was built in 2007, so it is 18 years old, younger 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 63,616 vehicles a day, roughly 13% of them trucks, projected to reach 77,500 by 2042. The structure is 90 ft (27.4 m) long and 63 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

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CarriesI-5 (hwy 1) NB
CrossesHWY 51 SB
Location020 MI N Marion-Clack LN
RouteInterstate 5
CountyClackamas County
StateOregon
Coordinates45.27927, -122.77001
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating56.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length90 ft (27.4 m)
Longest span90 ft (27.4 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic63,616 (2022)
Projected traffic77,500 by 2042
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed12.4 mi (20 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 (hwy 1) NB over HWY 51 SB built?

It was built in 2007, making it 18 years old in 2025.

What condition is I-5 (hwy 1) NB over HWY 51 SB 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 August 2024.

How much traffic does I-5 (hwy 1) NB over HWY 51 SB carry?

About 63,616 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is I-5 (hwy 1) NB over HWY 51 SB?

The structure is 90 ft (27.4 m) long with a longest span of 90 ft (27.4 m) and a deck 63 ft wide.

Who owns I-5 (hwy 1) NB over HWY 51 SB?

It is owned by the State Highway Agency.