Structure 80936000000000 · Thurston County, WA

Skookumchuck Road over Skookumchuck River

Carries Skookumchuck Road over Skookumchuck River, 2.3 SE Jct Sr507.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT150 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 8/9

150 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 multi-beam bridge.

Built198442 years old
Length149.9 ft45.7 m
Daily traffic981counted 2020
Last inspectedJuly 2023every 24 months

Location

StateWashington
CountyThurston
Location2.3 SE Jct Sr507
CarriesSkookumchuck Road
CrossesSkookumchuck River
Coordinates46.80738, -122.82408

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length149.9 ft (45.7 m)
Max Span145.0 ft (44.2 m)
Deck Width31.2 ft (9.5 m)
Deck Area434.1 sq m
Main Spans1
Year Built1984

Traffic

Avg Daily Traffic981 (2020)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number080936000000000

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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