Structure IC0000000 · King County, WA

SR 99 over Dexter Way N

Carries SR 99 over Dexter Way N, 7.4 N Jct SR 509.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT35 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 6/9 · sets the rating

35 ft end to end. Lengths and the car 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 tee-beam bridge.

Built193096 years old
Length35.1 ft10.7 m
Daily traffic28,629counted 2023
Last inspectedMarch 2024every 24 months

Location

StateWashington
CountyKing
Location7.4 N Jct SR 509
CarriesSR 99
CrossesDexter Way N
Coordinates47.63902, -122.34554

Physical Characteristics

MaterialConcrete
DesignTee Beam
Total Length35.1 ft (10.7 m)
Max Span35.1 ft (10.7 m)
Deck Width106.0 ft (32.3 m)
Deck Area345.6 sq m
Main Spans1
Year Built1930

Traffic

Avg Daily Traffic28,629 (2023)
Truck Traffic4%
Lanes On Bridge6
Lanes Under Bridge1

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000IC0000000

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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