US Bridges

I-5 over SR 516

Fair

King County, Washington · 7.2 N JCT SR 18 · Structure no. 0006820A0000000

Built
1962
63 years old, rebuilt 1991
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
269 ft
4 main spans
Daily traffic
104,261
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over SR 516 is a prestressed concrete stringer/multi-beam or girder carrying I-5 over SR 516 in King County, Washington. It was built in 1962 and reconstructed in 1991, so it is 63 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 104,261 vehicles a day, roughly 7% of them trucks, projected to reach 149,652 by 2039. The structure is 269 ft (82 m) long and 90 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5
CrossesSR 516
Location7.2 N JCT SR 18
RouteInterstate 5
CountyKing County
StateWashington
Coordinates47.39125, -122.29069
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating54 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length269 ft (82 m)
Longest span70 ft (21.3 m)
Deck width90 ft (27.4 m)
Roadway width84 ft (25.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic104,261 (2023)
Projected traffic149,652 by 2039
Trucks7%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over SR 516 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1991.

What condition is I-5 over SR 516 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 2024.

How much traffic does I-5 over SR 516 carry?

About 104,261 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-5 over SR 516?

The structure is 269 ft (82 m) long with a longest span of 70 ft (21.3 m) and a deck 90 ft wide.

Who owns I-5 over SR 516?

It is owned by the State Highway Agency.