US Bridges

SR 525 over Possession Sound

Good

Island County, Washington · 1.9 N JCT SR 526 · Structure no. 0016180A0000000

Built
2003
22 years old
Condition
Good
inspected June 2023
Type
Movable - Lift
Steel
Length
105 ft
1 main span
Daily traffic
1,078
2010 count
Owner
State
State Highway Agency

About this bridge

SR 525 over Possession Sound is a steel movable - lift carrying SR 525 over Possession Sound in Island County, Washington. It was built in 2003, so it is 22 years old, younger 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 1,078 vehicles a day, roughly 5% of them trucks, projected to reach 1,891 by 2036. The structure is 105 ft (32 m) long and 24 ft wide.

Location

Open in Google Maps
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

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than 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 rating68 US tons
Inventory rating41 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckClosed grating
Main spans1
Design loadHS 20
Structure length105 ft (32 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 traffic1,078 (2010)
Projected traffic1,891 by 2036
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 525 over Possession Sound built?

It was built in 2003, making it 22 years old in 2025.

What condition is SR 525 over Possession Sound 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 2023.

How much traffic does SR 525 over Possession Sound carry?

About 1,078 vehicles per day (2010 count), of which roughly 5% are trucks.

How long is SR 525 over Possession Sound?

The structure is 105 ft (32 m) long with a longest span of 80 ft (24.4 m) and a deck 24 ft wide.

Who owns SR 525 over Possession Sound?

It is owned by the State Highway Agency.