Structure JJ0000000 · Douglas County, WA

SR 155 over Columbia River

Carries SR 155 over Columbia River, 0.2 N Grant Co.

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
SEMI-TRUCK · 72 FT1,089 FT OVERALL200 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

1,089 ft end to end, longest span 550 ft: about 3.0 football fields. 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 through truss.

Built193591 years old
Length1088.9 ft331.9 m
Daily traffic4,923counted 2023
Last inspectedOctober 2023every 24 months

Location

StateWashington
CountyDouglas
Location0.2 N Grant Co
CarriesSR 155
CrossesColumbia River
Coordinates47.96539, -118.98233

Physical Characteristics

MaterialSteel Continuous
DesignTruss - Thru
Total Length1088.9 ft (331.9 m)
Max Span549.9 ft (167.6 m)
Deck Width22.0 ft (6.7 m)
Deck Area2223.7 sq m
Main Spans3
Year Built1935

Traffic

Avg Daily Traffic4,923 (2023)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour Critical8 — Stable, low risk
Structure Number000000JJ0000000

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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