Structure 87148000000000 · King County, WA

108th AVE SE over SE 274th ST

Carries 108th AVE SE over SE 274th ST, 27400 108th AVE SE.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT159 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

159 ft end to end: about 2 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.

Built199828 years old
Length159.1 ft48.5 m
Daily traffic8,500counted 2024
Last inspectedApril 2024every 24 months

Location

StateWashington
CountyKing
Location27400 108th AVE SE
Carries108th AVE SE
CrossesSE 274th ST
Coordinates47.35595, -122.19693

Physical Characteristics

MaterialConcrete
DesignBox Beam - Multiple
Total Length159.1 ft (48.5 m)
Max Span151.9 ft (46.3 m)
Deck Width59.1 ft (18 m)
Deck Area873 sq m
Main Spans1
Year Built1998

Traffic

Avg Daily Traffic8,500 (2024)
Truck Traffic3%
Lanes On Bridge3
Lanes Under Bridge5

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number087148000000000

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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