US Bridges

SR 160 over Puget Sound

Fair

King County, Washington · N End Vashon Island · Structure no. 00X3104A0000000

Built
1993
32 years old
Condition
Fair
inspected July 2023
Type
Movable - Lift
Steel
Length
110 ft
1 main span
Daily traffic
2,635
2010 count
Owner
State
State Highway Agency

About this bridge

SR 160 over Puget Sound is a steel movable - lift carrying SR 160 over Puget Sound in King County, Washington. It was built in 1993, so it is 32 years old, younger 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 2,635 vehicles a day, roughly 1% of them trucks, projected to reach 4,142 by 2036. The structure is 110 ft (33.5 m) long and 24 ft wide.

Location

Open in Google Maps
CarriesSR 160
CrossesPuget Sound
LocationN End Vashon Island
RouteState Highway 160
CountyKing County
StateWashington
Coordinates47.51064, -122.46361
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckClosed grating
Main spans1
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span80 ft (24.4 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic2,635 (2010)
Projected traffic4,142 by 2036
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollToll bridge
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 160 over Puget Sound built?

It was built in 1993, making it 32 years old in 2025.

What condition is SR 160 over Puget Sound 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 2023.

How much traffic does SR 160 over Puget Sound carry?

About 2,635 vehicles per day (2010 count), of which roughly 1% are trucks.

How long is SR 160 over Puget Sound?

The structure is 110 ft (33.5 m) long with a longest span of 80 ft (24.4 m) and a deck 24 ft wide.

Who owns SR 160 over Puget Sound?

It is owned by the State Highway Agency.