Structure 60506000001545 · King County, WA

Road over Martin Creek

Carries Road over Martin Creek, 0.1 Mi W Of 6710/230 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 overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT71 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

71 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.

Built1981rebuilt 2010
Length71.2 ft21.7 m
Daily traffic5counted 1995
Last inspectedOctober 2022every 48 months

Location

StateWashington
CountyKing
Location0.1 Mi W Of 6710/230 Jct
CarriesRoad
CrossesMartin Creek
Coordinates47.74875, -121.18145

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length71.2 ft (21.7 m)
Max Span68.9 ft (21 m)
Deck Width16.1 ft (4.9 m)
Deck Area106.3 sq m
Main Spans1
Year Built1981 (reconstructed 2010)

Traffic

Avg Daily Traffic5 (1995)
Lanes On Bridge1

Inspection & Ownership

Last InspectionOctober 2022
Inspection FrequencyEvery 48 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number060506000001545

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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