Structure 9550001P0000000 · Walla Walla County, WA

County Road 938 over Mill Creek

Carries County Road 938 over Mill Creek, 8 Miles West Of Walla Wal.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT93 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9Substructure 5/9 · sets the rating

93 ft end to end, longest span 47 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 tee-beam bridge.

Built196264 years old
Length92.8 ft28.3 m
Daily traffic500counted 2019
Last inspectedJuly 2024every 24 months

Location

StateWashington
CountyWalla Walla
Location8 Miles West Of Walla Wal
CarriesCounty Road 938
CrossesMill Creek
Coordinates46.04186, -118.47100

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length92.8 ft (28.3 m)
Max Span46.9 ft (14.3 m)
Deck Width32.2 ft (9.8 m)
Deck Area277.3 sq m
Main Spans2
Year Built1962

Traffic

Avg Daily Traffic500 (2019)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerNational Park Service
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number9550001P0000000

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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