Structure 11C0066 · Glenn County, CA

Road 62 over Colusa Drain

Carries Road 62 over Colusa Drain, 0.1 Mi E RD W.

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
CAR · 15 FT39 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

39 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.

Built196066 years old
Length39.0 ft11.9 m
Daily traffic31counted 2018
Last inspectedFebruary 2024every 24 months

Location

StateCalifornia
CountyGlenn
Location0.1 Mi E RD W
CarriesRoad 62
CrossesColusa Drain
Coordinates39.45031, -122.04383

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length39.0 ft (11.9 m)
Max Span37.1 ft (11.3 m)
Deck Width27.9 ft (8.5 m)
Deck Area101.2 sq m
Main Spans1
Year Built1960

Traffic

Avg Daily Traffic31 (2018)
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number11C0066

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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