Structure 7839B0000000 · King County, WA

SR 520 over 108th AVE NE

Carries SR 520 over 108th AVE NE, 5.2 E Jct SR 513.

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 FT271 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

271 ft end to end, longest span 118 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.

Built1966rebuilt 2014
Length271.0 ft82.6 m
Daily traffic26,760counted 2023
Last inspectedAugust 2024every 24 months

Location

StateWashington
CountyKing
Location5.2 E Jct SR 513
CarriesSR 520
Crosses108th AVE NE
Coordinates47.63989, -122.19664

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length271.0 ft (82.6 m)
Max Span118.1 ft (36 m)
Deck Width84.0 ft (25.6 m)
Deck Area2114.6 sq m
Main Spans3
Year Built1966 (reconstructed 2014)

Traffic

Avg Daily Traffic26,760 (2023)
Truck Traffic3%
Lanes On Bridge5
Lanes Under Bridge4

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number0007839B0000000

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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