US Bridges

SR 525 over Alderwood Mall Pkwy

Good

Snohomish County, Washington · 0.6 N JCT I-5 · Structure no. 0012036A0000000

Built
1983
42 years old, rebuilt 2002
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
212 ft
3 main spans
Daily traffic
33,261
2023 count
Owner
State
State Highway Agency

About this bridge

SR 525 over Alderwood Mall Pkwy is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 525 over Alderwood Mall Pkwy in Snohomish County, Washington. It was built in 1983 and reconstructed in 2002, so it is 42 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 33,261 vehicles a day, roughly 4% of them trucks, projected to reach 48,866 by 2039. The structure is 212 ft (64.6 m) long and 100 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSR 525
CrossesAlderwood Mall Pkwy
Location0.6 N JCT I-5
RouteState Highway 525
Coordinates47.83903, -122.27208
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionJanuary 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating40 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length212 ft (64.6 m)
Longest span92 ft (28 m)
Deck width100 ft (30.6 m)
Roadway width95 ft (29.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,261 (2023)
Projected traffic48,866 by 2039
Trucks4%
Lanes on structure5
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
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$9.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 525 over Alderwood Mall Pkwy built?

It was built in 1983, making it 42 years old in 2025. It was reconstructed in 2002.

What condition is SR 525 over Alderwood Mall Pkwy 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 January 2024.

How much traffic does SR 525 over Alderwood Mall Pkwy carry?

About 33,261 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is SR 525 over Alderwood Mall Pkwy?

The structure is 212 ft (64.6 m) long with a longest span of 92 ft (28 m) and a deck 100 ft wide.

Who owns SR 525 over Alderwood Mall Pkwy?

It is owned by the State Highway Agency.