Structure 9C0110 · Plumas County, CA

Dyson Lane over Mid Fk Feather Riv Ovrfl

Carries Dyson Lane over Mid Fk Feather Riv Ovrfl, 0.9 Mi E Bckwrth-calpn RD.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating5/9 · Fair
Substructure8/9 · Very Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT48 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9 · sets the ratingSubstructure 8/9

48 ft end to end, longest span 24 ft. 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.

Built195967 years old
Length47.9 ft14.6 m
Daily traffic22counted 2019
Last inspectedSeptember 2024every 24 months

Location

StateCalifornia
CountyPlumas
Location0.9 Mi E Bckwrth-calpn RD
CarriesDyson Lane
CrossesMid Fk Feather Riv Ovrfl
Coordinates39.75554, -120.35441

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length47.9 ft (14.6 m)
Max Span24.0 ft (7.3 m)
Deck Width16.4 ft (5 m)
Deck Area73 sq m
Main Spans2
Year Built1959

Traffic

Avg Daily Traffic22 (2019)
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number09C0110

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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