Structure 60506000001338 · King County, WA

Road over Tunnel Creek

Carries Road over Tunnel Creek, 0.5 Mi E Of Hy 2/6095 Jct.

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 FT57 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

57 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.

Built1980rebuilt 2010
Length56.8 ft17.3 m
Daily traffic8counted 1995
Last inspectedJune 2023every 24 months

Location

StateWashington
CountyKing
Location0.5 Mi E Of Hy 2/6095 Jct
CarriesRoad
CrossesTunnel Creek
Coordinates47.72113, -121.11494

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length56.8 ft (17.3 m)
Max Span54.8 ft (16.7 m)
Deck Width15.7 ft (4.8 m)
Deck Area83.0 sq m
Main Spans1
Year Built1980 (reconstructed 2010)

Traffic

Avg Daily Traffic8 (1995)
Lanes On Bridge1

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number060506000001338

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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