US Bridges

86th ST SE over Pilchuck River

FairPosted for load

Snohomish County, Washington · 0.7 SE JCT SR 2 · Structure no. 082311000000000

Built
1924
101 years old
Condition
Fair
inspected June 2024
Type
Truss - Thru
Steel
Length
227 ft
1 main span
Daily traffic
421
2019 count
Owner
County
County Highway Agency

About this bridge

86th ST SE over Pilchuck River is a steel truss - thru carrying 86th ST SE over Pilchuck River in Snohomish County, Washington. It was built in 1924, so it is 101 years old, older 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. Its operating status is: posted for load restriction.

It carries about 421 vehicles a day, roughly 10% of them trucks, projected to reach 1,000 by 2042. The structure is 227 ft (69.1 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries86th ST SE
CrossesPilchuck River
Location0.7 SE JCT SR 2
RouteCounty Highway 46700
CountySnohomish County
StateWashington
Coordinates47.91871, -122.08322
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.1 US tons
Inventory rating12.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadHS 15
Structure length227 ft (69.1 m)
Longest span127 ft (38.6 m)
Deck width20 ft (6 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deck15 ft (4.4 m)

Traffic and service

Average daily traffic421 (2019)
Projected traffic1,000 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$8.5 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 86th ST SE over Pilchuck River built?

It was built in 1924, making it 101 years old in 2025.

What condition is 86th ST SE over Pilchuck River 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 June 2024.

How much traffic does 86th ST SE over Pilchuck River carry?

About 421 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is 86th ST SE over Pilchuck River?

The structure is 227 ft (69.1 m) long with a longest span of 127 ft (38.6 m) and a deck 20 ft wide.

Who owns 86th ST SE over Pilchuck River?

It is owned by the County Highway Agency.