Structure 86248000000000 · King County, WA

15 SW To Supermall over 15th ST SW

Carries 15 SW To Supermall over 15th ST SW, 0.2 Mi E Of Jct Sr-167.

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
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT478 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

478 ft end to end, longest span 142 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.

Built199531 years old
Length478.0 ft145.7 m
Daily traffic3,700counted 2020
Last inspectedOctober 2024every 24 months

Location

StateWashington
CountyKing
Location0.2 Mi E Of Jct Sr-167
Carries15 SW To Supermall
Crosses15th ST SW
Coordinates47.29572, -122.25422

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length478.0 ft (145.7 m)
Max Span142.1 ft (43.3 m)
Deck Width28.9 ft (8.8 m)
Deck Area1282.2 sq m
Main Spans4
Year Built1995

Traffic

Avg Daily Traffic3,700 (2020)
Truck Traffic5%
Lanes On Bridge1
Lanes Under Bridge4

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number086248000000000

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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