Structure 574F009 04561 · Tillamook County, OR

Us101 (hwy 9) over Nehalem River

Carries Us101 (hwy 9) over Nehalem River, 005 Mi S Nehalem.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,062 FT OVERALL200 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 6/9

1,062 ft end to end, longest span 235 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 box-beam bridge.

Built198442 years old
Length1062.0 ft323.7 m
Daily traffic6,283counted 2022
Last inspectedMarch 2023every 24 months

Location

StateOregon
CountyTillamook
Location005 Mi S Nehalem
CarriesUs101 (hwy 9)
CrossesNehalem River
Coordinates45.70917, -123.88953

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignBox Beam - Multiple
Total Length1062.0 ft (323.7 m)
Max Span234.9 ft (71.6 m)
Deck Width43.6 ft (13.3 m)
Deck Area4305.2 sq m
Main Spans5
Year Built1984

Traffic

Avg Daily Traffic6,283 (2022)
Truck Traffic13%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number00574F009 04561

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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