Structure 499B0000000 · Whitman County, WA

SR 27 over Silver Creek

Carries SR 27 over Silver Creek, 8.4 N Jct SR 272.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT43 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 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 tee-beam bridge.

Built1922104 years old
Length43.0 ft13.1 m
Daily traffic1,454counted 2023
Last inspectedOctober 2024every 24 months

Location

StateWashington
CountyWhitman
Location8.4 N Jct SR 272
CarriesSR 27
CrossesSilver Creek
Coordinates47.00369, -117.13253

Physical Characteristics

MaterialConcrete
DesignTee Beam
Total Length43.0 ft (13.1 m)
Max Span40.0 ft (12.2 m)
Deck Width26.9 ft (8.2 m)
Deck Area107.4 sq m
Main Spans1
Year Built1922

Traffic

Avg Daily Traffic1,454 (2023)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number0000499B0000000

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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