Structure 12C0229 · Butte County, CA

Larkin RD over Feather River Outlet

Carries Larkin RD over Feather River Outlet, 1 Mi E/o Hamilton RD.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure6/9 · Satisfactory
Substructuresets the rating5/9 · Fair
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT94 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9Substructure 5/9 · sets the rating

94 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.

Built196660 years old
Length94.2 ft28.7 m
Daily traffic1,403counted 2019
Last inspectedOctober 2024every 24 months

Location

StateCalifornia
CountyButte
Location1 Mi E/o Hamilton RD
CarriesLarkin RD
CrossesFeather River Outlet
Coordinates39.45766, -121.63941

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length94.2 ft (28.7 m)
Max Span89.9 ft (27.4 m)
Deck Width35.1 ft (10.7 m)
Deck Area307.1 sq m
Main Spans1
Year Built1966

Traffic

Avg Daily Traffic1,403 (2019)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerOther State Agencies
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number12C0229

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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