Structure 9 0003 · Plumas County, CA

State Route 70 over North Fork Feather River

Carries State Route 70 over North Fork Feather River, 02-plu-070-5.58.

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 FT361 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

361 ft end to end, longest span 120 ft: about 5 semi-trucks nose to tail. 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.

Built193690 years old
Length360.9 ft110 m
Daily traffic1,345counted 2009
Last inspectedJune 2023every 24 months

Location

StateCalifornia
CountyPlumas
Location02-plu-070-5.58
CarriesState Route 70
CrossesNorth Fork Feather River
Coordinates39.91796, -121.32156

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length360.9 ft (110 m)
Max Span120.1 ft (36.6 m)
Deck Width26.6 ft (8.1 m)
Deck Area891 sq m
Main Spans2
Year Built1936

Traffic

Avg Daily Traffic1,345 (2009)
Truck Traffic14%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number09 0003

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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