US Bridges

I-5 Sbcd over King Jackson ST

Fair

King County, Washington · 0.3 N JCT I-90 · Structure no. 0007504D0000000

Built
1965
60 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
709 ft
9 main spans
Daily traffic
66,222
2012 count
Owner
State
State Highway Agency

About this bridge

I-5 Sbcd over King Jackson ST is a concrete continuous box beam or girders - multiple carrying I-5 Sbcd over King Jackson ST in King County, Washington. It was built in 1965, so it is 60 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 66,222 vehicles a day, roughly 10% of them trucks, projected to reach 110,723 by 2036. The structure is 709 ft (216.1 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-5 Sbcd
CrossesKing Jackson ST
Location0.3 N JCT I-90
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.59808, -122.32147
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20 + Mod
Structure length709 ft (216.1 m)
Longest span100 ft (30.5 m)
Deck width65 ft (19.7 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66,222 (2012)
Projected traffic110,723 by 2036
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$22.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 Sbcd over King Jackson ST built?

It was built in 1965, making it 60 years old in 2025.

What condition is I-5 Sbcd over King Jackson ST 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 Sbcd over King Jackson ST carry?

About 66,222 vehicles per day (2012 count), of which roughly 10% are trucks.

How long is I-5 Sbcd over King Jackson ST?

The structure is 709 ft (216.1 m) long with a longest span of 100 ft (30.5 m) and a deck 65 ft wide.

Who owns I-5 Sbcd over King Jackson ST?

It is owned by the State Highway Agency.