US Bridges

Marsh RD over Marshland Floodway

Good

Snohomish County, Washington · 1.4 W JCT SR 9 · Structure no. 086069000000000

Built
1994
31 years old
Condition
Good
inspected October 2024
Type
Slab
Prestressed Concrete
Length
54 ft
1 main span
Daily traffic
9,049
2021 count
Owner
County
County Highway Agency

About this bridge

Marsh RD over Marshland Floodway is a prestressed concrete slab carrying Marsh RD over Marshland Floodway in Snohomish County, Washington. It was built in 1994, so it is 31 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 9,049 vehicles a day, roughly 8% of them trucks, projected to reach 12,000 by 2046. The structure is 54 ft (16.6 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesMarsh RD
CrossesMarshland Floodway
Location1.4 W JCT SR 9
RouteCounty Highway 93617
Coordinates47.89673, -122.13764
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88 US tons
Inventory rating37 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length54 ft (16.6 m)
Longest span52 ft (16 m)
Deck width36 ft (11 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,049 (2021)
Projected traffic12,000 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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$2.3 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Marsh RD over Marshland Floodway built?

It was built in 1994, making it 31 years old in 2025.

What condition is Marsh RD over Marshland Floodway 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 October 2024.

How much traffic does Marsh RD over Marshland Floodway carry?

About 9,049 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Marsh RD over Marshland Floodway?

The structure is 54 ft (16.6 m) long with a longest span of 52 ft (16 m) and a deck 36 ft wide.

Who owns Marsh RD over Marshland Floodway?

It is owned by the County Highway Agency.