Structure 17474A0000000 · Walla Walla County, WA

US 12 over Myra RD

Carries US 12 over Myra RD, 27.7 E Jct US 730 Spur.

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
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT110 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

110 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 multi-beam bridge.

Built200917 years old
Length109.9 ft33.5 m
Daily traffic2,382counted 2023
Last inspectedJuly 2024every 24 months

Location

StateWashington
CountyWalla Walla
Location27.7 E Jct US 730 Spur
CarriesUS 12
CrossesMyra RD
Coordinates46.06986, -118.37006

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length109.9 ft (33.5 m)
Max Span107.0 ft (32.6 m)
Deck Width41.0 ft (12.5 m)
Deck Area418.8 sq m
Main Spans1
Year Built2009

Traffic

Avg Daily Traffic2,382 (2023)
Truck Traffic11%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalNot applicable
Structure Number0017474A0000000

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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