US Bridges

SR 9 over Pilchuck Creek

Good

Snohomish County, Washington · 5.3 N JCT SR 530 · Structure no. 0018363A0000000

Built
2014
11 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
560 ft
3 main spans
Daily traffic
2,411
2023 count
Owner
State
State Highway Agency

About this bridge

SR 9 over Pilchuck Creek is a steel continuous stringer/multi-beam or girder carrying SR 9 over Pilchuck Creek in Snohomish County, Washington. It was built in 2014, so it is 11 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 2,411 vehicles a day, roughly 8% of them trucks, projected to reach 3,436 by 2039. The structure is 560 ft (170.7 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 9
CrossesPilchuck Creek
Location5.3 N JCT SR 530
RouteState Highway 9
CountySnohomish County
StateWashington
Coordinates48.26384, -122.16648
Functional classRural Major 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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length560 ft (170.7 m)
Longest span220 ft (67.1 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,411 (2023)
Projected traffic3,436 by 2039
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$8.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 9 over Pilchuck Creek built?

It was built in 2014, making it 11 years old in 2025.

What condition is SR 9 over Pilchuck 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 August 2024.

How much traffic does SR 9 over Pilchuck Creek carry?

About 2,411 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 9 over Pilchuck Creek?

The structure is 560 ft (170.7 m) long with a longest span of 220 ft (67.1 m) and a deck 38 ft wide.

Who owns SR 9 over Pilchuck Creek?

It is owned by the State Highway Agency.