Structure 11C0057 · Glenn County, CA

County RD 306 over Salt Creek

Carries County RD 306 over Salt Creek, 0.3 Mi S Of RD #200.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 2 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating2/9 · Critical
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT102 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 2/9 · sets the rating

102 ft end to end, longest span 30 ft. 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 slab bridge.

Built194878 years old
Length102.0 ft31.1 m
Daily traffic300counted 2009
Last inspectedAugust 2024every 12 months

Location

StateCalifornia
CountyGlenn
Location0.3 Mi S Of RD #200
CarriesCounty RD 306
CrossesSalt Creek
Coordinates39.79013, -122.51930

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length102.0 ft (31.1 m)
Max Span29.9 ft (9.1 m)
Deck Width29.2 ft (8.9 m)
Deck Area276.8 sq m
Main Spans4
Year Built1948

Traffic

Avg Daily Traffic300 (2009)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical2 — Bridge closed (monitoring)
Structure Number11C0057

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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