US Bridges

US 2 over Slough

Good

King County, Washington · 6.6 E Snohomish CO · Structure no. 0013470A0000000

Built
1989
36 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
77 ft
1 main span
Daily traffic
6,441
2023 count
Owner
State
State Highway Agency

About this bridge

US 2 over Slough is a prestressed concrete stringer/multi-beam or girder carrying US 2 over Slough in King County, Washington. It was built in 1989, so it is 36 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 6,441 vehicles a day, roughly 5% of them trucks, projected to reach 9,200 by 2039. The structure is 77 ft (23.5 m) long and 53 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesUS 2
CrossesSlough
Location6.6 E Snohomish CO
RouteU.S. Route 2
Coordinates47.71931, -121.38703
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68 US tons
Inventory rating41 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20 + Mod
Structure length77 ft (23.5 m)
Longest span73 ft (22.3 m)
Deck width53 ft (16.2 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,441 (2023)
Projected traffic9,200 by 2039
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

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$1.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 2 over Slough built?

It was built in 1989, making it 36 years old in 2025.

What condition is US 2 over Slough 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 US 2 over Slough carry?

About 6,441 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 2 over Slough?

The structure is 77 ft (23.5 m) long with a longest span of 73 ft (22.3 m) and a deck 53 ft wide.

Who owns US 2 over Slough?

It is owned by the State Highway Agency.