Structure 12 0134 · Butte County, CA

State Route 70 over W Br Feather Riv(lk Oro)

Carries State Route 70 over W Br Feather Riv(lk Oro), 03-but-070-28.22.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT2,731 FT OVERALL500 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 7/9

2,731 ft end to end, longest span 576 ft: about 7.6 football fields. 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 deck truss.

Built196264 years old
Length2731.0 ft832.4 m
Daily traffic2,550counted 2020
Last inspectedApril 2023every 24 months

Location

StateCalifornia
CountyButte
Location03-but-070-28.22
CarriesState Route 70
CrossesW Br Feather Riv(lk Oro)
Coordinates39.66236, -121.53484

Physical Characteristics

MaterialSteel
DesignTruss - Deck
Total Length2731.0 ft (832.4 m)
Max Span576.1 ft (175.6 m)
Deck Width61.0 ft (18.6 m)
Deck Area15482.6 sq m
Main Spans4
Year Built1962

Traffic

Avg Daily Traffic2,550 (2020)
Lanes On Bridge4

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number12 0134

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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