US Bridges

High Bridge RD over Trib. Snoqualmie River

Fair

Snohomish County, Washington · 2.9 N King CO Line · Structure no. 083004000000000

Built
1983
42 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
277 ft
3 main spans
Daily traffic
3,221
2023 count
Owner
County
County Highway Agency

About this bridge

High Bridge RD over Trib. Snoqualmie River is a steel continuous stringer/multi-beam or girder carrying High Bridge RD over Trib. Snoqualmie River in Snohomish County, Washington. It was built in 1983, so it is 42 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 3,221 vehicles a day, roughly 12% of them trucks, projected to reach 4,000 by 2042. The structure is 277 ft (84.4 m) long and 31 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

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CarriesHigh Bridge RD
CrossesTrib. Snoqualmie River
Location2.9 N King CO Line
RouteCounty Highway 92655
CountySnohomish County
StateWashington
Coordinates47.80992, -122.01404
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length277 ft (84.4 m)
Longest span112 ft (34.1 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,221 (2023)
Projected traffic4,000 by 2042
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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$10.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was High Bridge RD over Trib. Snoqualmie River built?

It was built in 1983, making it 42 years old in 2025.

What condition is High Bridge RD over Trib. Snoqualmie 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 May 2024.

How much traffic does High Bridge RD over Trib. Snoqualmie River carry?

About 3,221 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is High Bridge RD over Trib. Snoqualmie River?

The structure is 277 ft (84.4 m) long with a longest span of 112 ft (34.1 m) and a deck 31 ft wide.

Who owns High Bridge RD over Trib. Snoqualmie River?

It is owned by the County Highway Agency.