US Bridges

Swede Heaven RD over N.F.Stillaguamish River

Good

Snohomish County, Washington · 0.8 N JCT SR 530 · Structure no. 085960000000000

Built
1991
34 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
308 ft
3 main spans
Daily traffic
986
2021 count
Owner
County
County Highway Agency

About this bridge

Swede Heaven RD over N.F.Stillaguamish River is a prestressed concrete continuous stringer/multi-beam or girder carrying Swede Heaven RD over N.F.Stillaguamish River in Snohomish County, Washington. It was built in 1991, so it is 34 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 986 vehicles a day, roughly 16% of them trucks, projected to reach 1,200 by 2040. The structure is 308 ft (93.9 m) long and 37 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSwede Heaven RD
CrossesN.F.Stillaguamish River
Location0.8 N JCT SR 530
RouteCounty Highway 84150
Coordinates48.27994, -121.70289
Functional classRural Local

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 inspectionMay 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating81 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length308 ft (93.9 m)
Longest span128 ft (39 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic986 (2021)
Projected traffic1,200 by 2040
Trucks16%
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$11.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1991, making it 34 years old in 2025.

What condition is Swede Heaven RD over N.F.Stillaguamish River 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 May 2024.

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

About 986 vehicles per day (2021 count), of which roughly 16% are trucks.

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

The structure is 308 ft (93.9 m) long with a longest span of 128 ft (39 m) and a deck 37 ft wide.

Who owns Swede Heaven RD over N.F.Stillaguamish River?

It is owned by the County Highway Agency.