US Bridges

I-5 N-W Ramp over SR 432 E-S Ramp

Fair

Cowlitz County, Washington · 15.8 N JCT SR 503 · Structure no. 0006025A0000000

Built
1959
66 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
183 ft
3 main spans
Daily traffic
13,089
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 N-W Ramp over SR 432 E-S Ramp is a concrete continuous box beam or girders - multiple carrying I-5 N-W Ramp over SR 432 E-S Ramp in Cowlitz County, Washington. It was built in 1959, so it is 66 years old, older than the Washington average of 49.8 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 13,089 vehicles a day, roughly 17% of them trucks, projected to reach 17,469 by 2039. The structure is 183 ft (55.8 m) long and 34 ft wide.

Location

Open in Google Maps
CarriesI-5 N-W Ramp
CrossesSR 432 E-S Ramp
Location15.8 N JCT SR 503
RouteInterstate 5
CountyCowlitz County
StateWashington
Coordinates46.10514, -122.87633
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.5 US tons
Inventory rating25 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length183 ft (55.8 m)
Longest span72 ft (21.9 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,089 (2023)
Projected traffic17,469 by 2039
Trucks17%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 N-W Ramp over SR 432 E-S Ramp built?

It was built in 1959, making it 66 years old in 2025.

What condition is I-5 N-W Ramp over SR 432 E-S 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 October 2023.

How much traffic does I-5 N-W Ramp over SR 432 E-S Ramp carry?

About 13,089 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is I-5 N-W Ramp over SR 432 E-S Ramp?

The structure is 183 ft (55.8 m) long with a longest span of 72 ft (21.9 m) and a deck 34 ft wide.

Who owns I-5 N-W Ramp over SR 432 E-S Ramp?

It is owned by the State Highway Agency.