Structure 39C348350800219 · Lane County, OR

Ferguson Road over Long Tom River

Carries Ferguson Road over Long Tom River, 040 Mi NW Junction City.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT134 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 6/9Substructure 5/9 · sets the rating

134 ft end to end, longest span 46 ft. 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 slab bridge.

Built197848 years old
Length133.9 ft40.8 m
Daily traffic832counted 2020
Last inspectedJuly 2024every 24 months

Location

StateOregon
CountyLane
Location040 Mi NW Junction City
CarriesFerguson Road
CrossesLong Tom River
Coordinates44.25172, -123.26687

Physical Characteristics

MaterialPrestressed Concrete
DesignSlab
Total Length133.9 ft (40.8 m)
Max Span45.9 ft (14 m)
Deck Width32.2 ft (9.8 m)
Deck Area399.8 sq m
Main Spans3
Year Built1978

Traffic

Avg Daily Traffic832 (2020)
Truck Traffic20%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number39C348350800219

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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