Structure 39C17A260000087 · Lane County, OR

Cot Gr-lorane RD over Silk Creek

Carries Cot Gr-lorane RD over Silk Creek, 008 Mi W HWY 99.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT50 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 5/9 · sets the rating

50 ft end to end. Lengths and the car 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 multi-beam bridge.

Built197650 years old
Length49.9 ft15.2 m
Daily traffic3,601counted 2020
Last inspectedSeptember 2024every 24 months

Location

StateOregon
CountyLane
Location008 Mi W HWY 99
CarriesCot Gr-lorane RD
CrossesSilk Creek
Coordinates43.79758, -123.07570

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length49.9 ft (15.2 m)
Max Span47.9 ft (14.6 m)
Deck Width62.3 ft (19 m)
Deck Area288.8 sq m
Main Spans1
Year Built1976

Traffic

Avg Daily Traffic3,601 (2020)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalUnknown
Structure Number39C17A260000087

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.

Nearby Bridges