Structure 2323 102 06128 · Columbia County, OR

Or 47 (hwy 102) over Nehalem River

Carries Or 47 (hwy 102) over Nehalem River, Vernonia City Limits.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT210 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 4/9 · sets the ratingSubstructure 5/9

210 ft end to end: about 3 semi-trucks nose to tail. 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.

Built193888 years old
Length209.6 ft63.9 m
Daily traffic2,938counted 2022
Last inspectedMay 2024every 12 months

Location

StateOregon
CountyColumbia
LocationVernonia City Limits
CarriesOr 47 (hwy 102)
CrossesNehalem River
Coordinates45.85816, -123.17267

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length209.6 ft (63.9 m)
Max Span120.4 ft (36.7 m)
Deck Width38.1 ft (11.6 m)
Deck Area741.2 sq m
Main Spans1
Year Built1938

Traffic

Avg Daily Traffic2,938 (2022)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number02323 102 06128

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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