Structure 51153000001077 · Butte County, CA

Road 20n15 over S Fork Feather River

Carries Road 20n15 over S Fork Feather River, No Data Entered.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT131 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

131 ft end to end. 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 through truss.

Built1950rebuilt 2000
Length130.6 ft39.8 m
Daily traffic5counted 2016
Last inspectedSeptember 2024every 12 months

Location

StateCalifornia
CountyButte
LocationNo Data Entered
CarriesRoad 20n15
CrossesS Fork Feather River
Coordinates39.60762, -121.15222

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length130.6 ft (39.8 m)
Max Span129.6 ft (39.5 m)
Deck Width13.1 ft (4 m)
Deck Area159.2 sq m
Main Spans1
Year Built1950 (reconstructed 2000)

Traffic

Avg Daily Traffic5 (2016)
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number051153000001077

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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