US Bridges

State Avenue over Quilceda Creek

Good

Snohomish County, Washington · 1.2 NE JCT I-5 · Structure no. 089309000000000

Built
2022
3 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
101 ft
1 main span
Daily traffic
16,432
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

State Avenue over Quilceda Creek is a prestressed concrete stringer/multi-beam or girder carrying State Avenue over Quilceda Creek in Snohomish County, Washington. It was built in 2022, so it is 3 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 16,432 vehicles a day, roughly 8% of them trucks, projected to reach 22,000 by 2044. The structure is 101 ft (30.9 m) long and 69 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesState Avenue
CrossesQuilceda Creek
Location1.2 NE JCT I-5
RouteCity Street 745
Coordinates48.08651, -122.17275
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating58.2 US tons
Inventory rating42.5 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length101 ft (30.9 m)
Longest span97 ft (29.5 m)
Deck width69 ft (21 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,432 (2019)
Projected traffic22,000 by 2044
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$7.8 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was State Avenue over Quilceda Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is State Avenue over Quilceda Creek 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 December 2023.

How much traffic does State Avenue over Quilceda Creek carry?

About 16,432 vehicles per day (2019 count), of which roughly 8% are trucks.

How long is State Avenue over Quilceda Creek?

The structure is 101 ft (30.9 m) long with a longest span of 97 ft (29.5 m) and a deck 69 ft wide.

Who owns State Avenue over Quilceda Creek?

It is owned by the City or Municipal Highway Agency.