Structure 2003930000000 · Mason County, WA

SR 106 over Alderbrook Ped Path

Carries SR 106 over Alderbrook Ped Path, 7.0 E Jct US 101.

Overall conditionGood

Set by its lowest-rated component: Superstructure and Substructure at 8 of 9.

How ratings work
Superstructuresets the rating8/9 · Very Good
Substructuresets the rating8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT32 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck not ratedSuperstructure 8/9Substructure 8/9

32 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 deck arch.

Built200719 years old
Length32.2 ft9.8 m
Daily traffic2,353counted 2023
Last inspectedOctober 2024every 24 months

Location

StateWashington
CountyMason
Location7.0 E Jct US 101
CarriesSR 106
CrossesAlderbrook Ped Path
Coordinates47.34656, -123.07072

Physical Characteristics

MaterialConcrete
DesignArch - Deck
Total Length32.2 ft (9.8 m)
Max Span23.0 ft (7 m)
Deck Width44.0 ft (13.4 m)
Deck Area131.3 sq m
Main Spans1
Year Built2007

Traffic

Avg Daily Traffic2,353 (2023)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number002003930000000

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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