Structure 1204 027 04303 · Benton County, OR

Or 34 (hwy 27) over N. Fork Alsea River

Carries Or 34 (hwy 27) over N. Fork Alsea River, 032 Mi E Alsea.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT171 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 7/9

171 ft end to end: about 2 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.

Built192799 years old
Length170.6 ft52 m
Daily traffic1,633counted 2022
Last inspectedOctober 2023every 24 months

Location

StateOregon
CountyBenton
Location032 Mi E Alsea
CarriesOr 34 (hwy 27)
CrossesN. Fork Alsea River
Coordinates44.41573, -123.56257

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length170.6 ft (52 m)
Max Span100.4 ft (30.6 m)
Deck Width23.3 ft (7.1 m)
Deck Area369.2 sq m
Main Spans1
Year Built1927

Traffic

Avg Daily Traffic1,633 (2022)
Truck Traffic16%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number01204 027 04303

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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