US Bridges

SR 160 over Puget Sound @ Pt Vashon

FairPosted for load

King County, Washington · N End Vashon Island · Structure no. 0005713A0000000

Built
1957
68 years old, rebuilt 1990
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
744 ft
36 main spans
Daily traffic
7,310
2010 count
Owner
State
State Highway Agency

About this bridge

SR 160 over Puget Sound @ Pt Vashon is a wood or timber stringer/multi-beam or girder carrying SR 160 over Puget Sound @ Pt Vashon in King County, Washington. It was built in 1957 and reconstructed in 1990, so it is 68 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 7,310 vehicles a day, roughly 1% of them trucks, projected to reach 11,491 by 2036. The structure is 744 ft (226.8 m) long and 52 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

Location

Open in Google Maps
CarriesSR 160
CrossesPuget Sound @ Pt Vashon
LocationN End Vashon Island
RouteState Highway 160
CountyKing County
StateWashington
Coordinates47.50858, -122.46419
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating19 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans36 (+4 approach)
Design loadH 10
Structure length744 ft (226.8 m)
Longest span19 ft (5.8 m)
Deck width52 ft (15.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,310 (2010)
Projected traffic11,491 by 2036
Trucks1%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed44.7 mi (72 km)
TollToll bridge
National Highway SystemNo

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$15.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 160 over Puget Sound @ Pt Vashon built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1990.

What condition is SR 160 over Puget Sound @ Pt Vashon 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 July 2024.

How much traffic does SR 160 over Puget Sound @ Pt Vashon carry?

About 7,310 vehicles per day (2010 count), of which roughly 1% are trucks.

How long is SR 160 over Puget Sound @ Pt Vashon?

The structure is 744 ft (226.8 m) long with a longest span of 19 ft (5.8 m) and a deck 52 ft wide.

Who owns SR 160 over Puget Sound @ Pt Vashon?

It is owned by the State Highway Agency.