US Bridges

SR 525 over Possession Sound

Good

Snohomish County, Washington · 1.9 N JCT SR 526 · Structure no. 0019338A0000000

Built
2020
5 years old
Condition
Good
inspected June 2023
Type
Movable - Lift
Steel
Length
107 ft
1 main span
Daily traffic
13,078
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 Snohomish County, Washington. It was built in 2020, so it is 5 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 13,078 vehicles a day, roughly 2% of them trucks, projected to reach 22,259 by 2036. The structure is 107 ft (32.6 m) long and 24 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 525
CrossesPossession Sound
Location1.9 N JCT SR 526
RouteState Highway 525
CountySnohomish County
StateWashington
Coordinates47.95029, -122.29683
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable 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 rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeMovable - Lift
MaterialSteel
DeckSteel plate
Main spans1 (+2 approach)
Design loadHL 93
Structure length107 ft (32.6 m)
Longest span75 ft (22.9 m)
Deck width24 ft (7.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,078 (2010)
Projected traffic22,259 by 2036
Trucks2%
Lanes on structure2
Traffic directionOne-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$1.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 525 over Possession Sound built?

It was built in 2020, making it 5 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 13,078 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is SR 525 over Possession Sound?

The structure is 107 ft (32.6 m) long with a longest span of 75 ft (22.9 m) and a deck 24 ft wide.

Who owns SR 525 over Possession Sound?

It is owned by the State Highway Agency.