US Bridges

Alderwood M Blvd over SR 524 E-S I-5 S-E

Good

Snohomish County, Washington · 1.5 E JCT SR 99 · Structure no. 002003670000000

Built
1999
26 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
244 ft
2 main spans
Daily traffic
15,848
2019 count
Owner
State
State Highway Agency

About this bridge

Alderwood M Blvd over SR 524 E-S I-5 S-E is a prestressed concrete continuous stringer/multi-beam or girder carrying Alderwood M Blvd over SR 524 E-S I-5 S-E in Snohomish County, Washington. It was built in 1999, so it is 26 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 15,848 vehicles a day, roughly 8% of them trucks, projected to reach 19,652 by 2039. The structure is 244 ft (74.4 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesAlderwood M Blvd
CrossesSR 524 E-S I-5 S-E
Location1.5 E JCT SR 99
RouteCity Street 0
CountySnohomish County
StateWashington
Coordinates47.81969, -122.28325
Functional classUrban Collector

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 inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating65 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length244 ft (74.4 m)
Longest span117 ft (35.7 m)
Deck width63 ft (19.1 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,848 (2019)
Projected traffic19,652 by 2039
Trucks8%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
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$5.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Alderwood M Blvd over SR 524 E-S I-5 S-E built?

It was built in 1999, making it 26 years old in 2025.

What condition is Alderwood M Blvd over SR 524 E-S I-5 S-E 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 July 2024.

How much traffic does Alderwood M Blvd over SR 524 E-S I-5 S-E carry?

About 15,848 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is Alderwood M Blvd over SR 524 E-S I-5 S-E?

The structure is 244 ft (74.4 m) long with a longest span of 117 ft (35.7 m) and a deck 63 ft wide.

Who owns Alderwood M Blvd over SR 524 E-S I-5 S-E?

It is owned by the State Highway Agency.