US Bridges

SR 525 over Possession Sound

Fair

Island County, Washington · 1.9 N JCT SR 526 · Structure no. 0015461A0000000

Built
2000
25 years old, rebuilt 2003
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
615 ft
25 main spans
Daily traffic
13,078
2010 count
Owner
State
State Highway Agency

About this bridge

SR 525 over Possession Sound is a concrete slab carrying SR 525 over Possession Sound in Island County, Washington. It was built in 2000 and reconstructed in 2003, so it is 25 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 13,078 vehicles a day, roughly 5% of them trucks, projected to reach 22,939 by 2036. The structure is 615 ft (187.5 m) long and 161 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesSR 525
CrossesPossession Sound
Location1.9 N JCT SR 526
RouteState Highway 525
CountyIsland County
StateWashington
Coordinates47.975, -122.34833
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating34.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans25
Design loadH 15
Structure length615 ft (187.5 m)
Longest span25 ft (7.6 m)
Deck width161 ft (49.1 m)
Roadway width135 ft (41.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,078 (2010)
Projected traffic22,939 by 2036
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollToll bridge
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$29.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 525 over Possession Sound built?

It was built in 2000, making it 25 years old in 2025. It was reconstructed in 2003.

What condition is SR 525 over Possession 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 June 2023.

How much traffic does SR 525 over Possession Sound carry?

About 13,078 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is SR 525 over Possession Sound?

The structure is 615 ft (187.5 m) long with a longest span of 25 ft (7.6 m) and a deck 161 ft wide.

Who owns SR 525 over Possession Sound?

It is owned by the State Highway Agency.