Structure 83004000000000 · Snohomish County, WA

High Bridge RD over Trib. Snoqualmie River

Carries High Bridge RD over Trib. Snoqualmie River, 2.9 N King Co Line.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT277 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

277 ft end to end, longest span 112 ft: about 4 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built198343 years old
Length276.9 ft84.4 m
Daily traffic3,221counted 2023
Last inspectedMay 2024every 24 months

Location

StateWashington
CountySnohomish
Location2.9 N King Co Line
CarriesHigh Bridge RD
CrossesTrib. Snoqualmie River
Coordinates47.80992, -122.01404

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length276.9 ft (84.4 m)
Max Span111.9 ft (34.1 m)
Deck Width31.2 ft (9.5 m)
Deck Area801.8 sq m
Main Spans3
Year Built1983

Traffic

Avg Daily Traffic3,221 (2023)
Truck Traffic12%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical7 — Countermeasures installed
Structure Number083004000000000

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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