Structure 8569A0000000 · King County, WA

160th/brickyard RD over I-405

Carries 160th/brickyard RD over I-405, 7.8 N Jct SR 520.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT292 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

292 ft end to end, longest span 154 ft: about 4 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 box-beam bridge.

Built1969rebuilt 1996
Length292.0 ft89 m
Daily traffic30,405counted 2007
Last inspectedApril 2024every 24 months

Location

StateWashington
CountyKing
Location7.8 N Jct SR 520
Carries160th/brickyard RD
CrossesI-405
Coordinates47.74250, -122.18747

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignBox Beam - Multiple
Total Length292.0 ft (89 m)
Max Span153.9 ft (46.9 m)
Deck Width78.4 ft (23.9 m)
Deck Area2127.1 sq m
Main Spans2
Year Built1969 (reconstructed 1996)

Traffic

Avg Daily Traffic30,405 (2007)
Truck Traffic5%
Lanes On Bridge5
Lanes Under Bridge10

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number0008569A0000000

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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