US Bridges

Marine Drive over Hatt Slough

Fair

Snohomish County, Washington · 2.5 S JCT SR532 · Structure no. 084281000000000

Built
1985
40 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
800 ft
3 main spans
Daily traffic
6,132
2022 count
Owner
County
County Highway Agency

About this bridge

Marine Drive over Hatt Slough is a prestressed concrete continuous stringer/multi-beam or girder carrying Marine Drive over Hatt Slough in Snohomish County, Washington. It was built in 1985, so it is 40 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 6,132 vehicles a day, roughly 10% of them trucks, projected to reach 10,000 by 2042. The structure is 800 ft (243.8 m) long and 43 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesMarine Drive
CrossesHatt Slough
Location2.5 S JCT SR532
RouteCounty Highway 96832
CountySnohomish County
StateWashington
Coordinates48.21, -122.33667
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckOther
Main spans3 (+2 approach)
Design loadHS 20
Structure length800 ft (243.8 m)
Longest span210 ft (64 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,132 (2022)
Projected traffic10,000 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$29.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Marine Drive over Hatt Slough built?

It was built in 1985, making it 40 years old in 2025.

What condition is Marine Drive over Hatt Slough in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does Marine Drive over Hatt Slough carry?

About 6,132 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Marine Drive over Hatt Slough?

The structure is 800 ft (243.8 m) long with a longest span of 210 ft (64 m) and a deck 43 ft wide.

Who owns Marine Drive over Hatt Slough?

It is owned by the County Highway Agency.