Structure 84349000000000 · King County, WA

Foss River Road over Foss River

Carries Foss River Road over Foss River, 0.8 Mi SE Sr-2 Mp 50.6.

Overall conditionFair

Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructuresets the rating5/9 · Fair
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT122 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 5/9 · sets the rating

122 ft end to end. 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 through truss.

Built195175 years old
Length122.0 ft37.2 m
Daily traffic40counted 2024
Last inspectedJune 2024every 24 months

Location

StateWashington
CountyKing
Location0.8 Mi SE Sr-2 Mp 50.6
CarriesFoss River Road
CrossesFoss River
Coordinates47.70451, -121.30542

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length122.0 ft (37.2 m)
Max Span82.0 ft (25 m)
Deck Width17.4 ft (5.3 m)
Deck Area197.2 sq m
Main Spans1
Year Built1951

Traffic

Avg Daily Traffic40 (2024)
Truck Traffic5%
Lanes On Bridge1

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour Critical7 — Countermeasures installed
Structure Number084349000000000

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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