US Bridges

SR 204 over Ebey Slough

Good

Snohomish County, Washington · JCT US 2 · Structure no. 0008176B0000000

Built
1967
58 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete Continuous
Length
202 ft
5 main spans
Daily traffic
14,511
2023 count
Owner
State
State Highway Agency

About this bridge

SR 204 over Ebey Slough is a concrete continuous slab carrying SR 204 over Ebey Slough in Snohomish County, Washington. It was built in 1967, so it is 58 years old, older 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 14,511 vehicles a day, roughly 5% of them trucks, projected to reach 20,592 by 2039. The structure is 202 ft (61.6 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesSR 204
CrossesEbey Slough
LocationJCT US 2
RouteState Highway 204
Coordinates47.97894, -122.13794
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.
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 evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length202 ft (61.6 m)
Longest span42 ft (12.8 m)
Deck width28 ft (8.5 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,511 (2023)
Projected traffic20,592 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesRelief for waterway
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$2.9 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 204 over Ebey Slough built?

It was built in 1967, making it 58 years old in 2025.

What condition is SR 204 over Ebey 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 August 2024.

How much traffic does SR 204 over Ebey Slough carry?

About 14,511 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is SR 204 over Ebey Slough?

The structure is 202 ft (61.6 m) long with a longest span of 42 ft (12.8 m) and a deck 28 ft wide.

Who owns SR 204 over Ebey Slough?

It is owned by the State Highway Agency.