Structure 60501000001429 · Whatcom County, WA

Rd. 31. Mp 7.1 over Kidney Creek

Carries Rd. 31. Mp 7.1 over Kidney Creek, 7.1 Miles From SH 542.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
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 FT103 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

103 ft end to end, longest span 65 ft. 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 rigid-frame bridge.

Built195373 years old
Length103.0 ft31.4 m
Daily traffic73counted 1996
Last inspectedSeptember 2024every 24 months

Location

StateWashington
CountyWhatcom
Location7.1 Miles From SH 542
CarriesRd. 31. Mp 7.1
CrossesKidney Creek
Coordinates48.94847, -121.93355

Physical Characteristics

MaterialConcrete Continuous
DesignFrame
Total Length103.0 ft (31.4 m)
Max Span65.0 ft (19.8 m)
Deck Width16.1 ft (4.9 m)
Deck Area153.9 sq m
Main Spans3
Year Built1953

Traffic

Avg Daily Traffic73 (1996)
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number060501000001429

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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