Structure 88267000000000 · King County, WA

4th AVE NW over North Fork Issaquah CR

Carries 4th AVE NW over North Fork Issaquah CR, 0.3 Mi N Of Gilman.

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
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT43 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

43 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 multi-beam bridge.

Built201115 years old
Length43.0 ft13.1 m
Daily traffic5,500counted 2019
Last inspectedOctober 2024every 24 months

Location

StateWashington
CountyKing
Location0.3 Mi N Of Gilman
Carries4th AVE NW
CrossesNorth Fork Issaquah CR
Coordinates47.54603, -122.04178

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length43.0 ft (13.1 m)
Max Span38.1 ft (11.6 m)
Deck Width61.0 ft (18.6 m)
Deck Area243.7 sq m
Main Spans1
Year Built2011

Traffic

Avg Daily Traffic5,500 (2019)
Truck Traffic5%
Lanes On Bridge3

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number088267000000000

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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