US Bridges

I-5 over S 272nd ST

Good

King County, Washington · 4.8 N JCT SR 18 · Structure no. 0006313D0000000

Built
1961
64 years old, rebuilt 2002
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
151 ft
3 main spans
Daily traffic
92,376
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over S 272nd ST is a prestressed concrete stringer/multi-beam or girder carrying I-5 over S 272nd ST in King County, Washington. It was built in 1961 and reconstructed in 2002, so it is 64 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 92,376 vehicles a day, roughly 7% of them trucks, projected to reach 132,593 by 2039. The structure is 151 ft (46 m) long and 92 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-5
CrossesS 272nd ST
Location4.8 N JCT SR 18
RouteInterstate 5
Coordinates47.35767, -122.29681
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating46 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length151 ft (46 m)
Longest span49 ft (14.9 m)
Deck width92 ft (27.9 m)
Roadway width89 ft (27 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic92,376 (2023)
Projected traffic132,593 by 2039
Trucks7%
Lanes on structure5
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$5.9 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-5 over S 272nd ST built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2002.

What condition is I-5 over S 272nd ST in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does I-5 over S 272nd ST carry?

About 92,376 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I-5 over S 272nd ST?

The structure is 151 ft (46 m) long with a longest span of 49 ft (14.9 m) and a deck 92 ft wide.

Who owns I-5 over S 272nd ST?

It is owned by the State Highway Agency.