US Bridges

Swede Heaven RD over Trib.N.F.Stillaguamish R

Fair

Snohomish County, Washington · 2.1 NW JCT SR 530 · Structure no. 079713000000000

Built
1985
40 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
1 main span
Daily traffic
529
2021 count
Owner
County
County Highway Agency

About this bridge

Swede Heaven RD over Trib.N.F.Stillaguamish R is a wood or timber stringer/multi-beam or girder carrying Swede Heaven RD over Trib.N.F.Stillaguamish R 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 5 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 529 vehicles a day, roughly 15% of them trucks, projected to reach 800 by 2044. The structure is 31 ft (9.5 m) long and 25 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSwede Heaven RD
CrossesTrib.N.F.Stillaguamish R
Location2.1 NW JCT SR 530
RouteCounty Highway 84150
CountySnohomish County
StateWashington
Coordinates48.28416, -121.7249
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 15
Structure length31 ft (9.5 m)
Longest span28 ft (8.5 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic529 (2021)
Projected traffic800 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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$1.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Swede Heaven RD over Trib.N.F.Stillaguamish R built?

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

What condition is Swede Heaven RD over Trib.N.F.Stillaguamish R 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 April 2024.

How much traffic does Swede Heaven RD over Trib.N.F.Stillaguamish R carry?

About 529 vehicles per day (2021 count), of which roughly 15% are trucks.

How long is Swede Heaven RD over Trib.N.F.Stillaguamish R?

The structure is 31 ft (9.5 m) long with a longest span of 28 ft (8.5 m) and a deck 25 ft wide.

Who owns Swede Heaven RD over Trib.N.F.Stillaguamish R?

It is owned by the County Highway Agency.