US Bridges

I-5 Ramp over Airport Way S

Fair

King County, Washington · 5.9 N JCT SR 900 · Structure no. 0007686A0000000

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
808 ft
8 main spans
Daily traffic
3,824
2012 count
Owner
State
State Highway Agency

About this bridge

I-5 Ramp over Airport Way S is a concrete continuous box beam or girders - multiple carrying I-5 Ramp over Airport Way S in King County, Washington. It was built in 1967, so it is 58 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 3,824 vehicles a day, roughly 5% of them trucks, projected to reach 6,394 by 2036. The structure is 808 ft (246.4 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 Ramp
CrossesAirport Way S
Location5.9 N JCT SR 900
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.57775, -122.32197
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating51 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8 (+5 approach)
Design loadHS 20
Structure length808 ft (246.4 m)
Longest span101 ft (30.8 m)
Deck width26 ft (7.8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,824 (2012)
Projected traffic6,394 by 2036
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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$9.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 Ramp over Airport Way S built?

It was built in 1967, making it 58 years old in 2025.

What condition is I-5 Ramp over Airport Way S 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 2023.

How much traffic does I-5 Ramp over Airport Way S carry?

About 3,824 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is I-5 Ramp over Airport Way S?

The structure is 808 ft (246.4 m) long with a longest span of 101 ft (30.8 m) and a deck 26 ft wide.

Who owns I-5 Ramp over Airport Way S?

It is owned by the State Highway Agency.