Structure 85298000000000 · King County, WA

SW Spokane ST over Duwamish River E Waterwy

Carries SW Spokane ST over Duwamish River E Waterwy, 800 SW Spokane ST.

Overall conditionFair

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

How ratings work
Deck8/9 · Very Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT485 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 6/9 · sets the ratingSubstructure 7/9

485 ft end to end, longest span 88 ft: about 7 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.

Built197650 years old
Length484.9 ft147.8 m
Daily traffic8,800counted 2018
Last inspectedJuly 2023every 24 months

Location

StateWashington
CountyKing
Location800 SW Spokane ST
CarriesSW Spokane ST
CrossesDuwamish River E Waterwy
Coordinates47.57151, -122.34627

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length484.9 ft (147.8 m)
Max Span87.9 ft (26.8 m)
Deck Width70.5 ft (21.5 m)
Deck Area3177.7 sq m
Main Spans6
Year Built1976

Traffic

Avg Daily Traffic8,800 (2018)
Truck Traffic35%
Lanes On Bridge5

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number085298000000000

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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