Structure 6068D0000000 · King County, WA

SR 18 over Soos CR

Carries SR 18 over Soos CR, 6.7 E Jct SR 164.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT120 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

120 ft end to end, longest span 47 ft. 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 slab bridge.

Built1959rebuilt 1979
Length120.1 ft36.6 m
Daily traffic26,257counted 2023
Last inspectedMarch 2024every 24 months

Location

StateWashington
CountyKing
Location6.7 E Jct SR 164
CarriesSR 18
CrossesSoos CR
Coordinates47.35289, -122.12992

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length120.1 ft (36.6 m)
Max Span46.9 ft (14.3 m)
Deck Width45.6 ft (13.9 m)
Deck Area508.7 sq m
Main Spans3
Year Built1959 (reconstructed 1979)

Traffic

Avg Daily Traffic26,257 (2023)
Truck Traffic14%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number0006068D0000000

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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