Structure 11C0016 · Glenn County, CA

Road 67 over Howard Slough

Carries Road 67 over Howard Slough, 1.7 Mi East Of CR Z.

Overall conditionPoor

Set by its lowest-rated component: Deck at 4 of 9.

How ratings work
Decksets the rating4/9 · Poor
Superstructure5/9 · Fair
Substructure5/9 · Fair
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT222 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 5/9Substructure 5/9

222 ft end to end, longest span 20 ft: about 3 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 multi-beam bridge.

Built195076 years old
Length222.1 ft67.7 m
Daily traffic93counted 2010
Last inspectedAugust 2024every 24 months

Location

StateCalifornia
CountyGlenn
Location1.7 Mi East Of CR Z
CarriesRoad 67
CrossesHoward Slough
Coordinates39.42018, -121.90239

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length222.1 ft (67.7 m)
Max Span20.0 ft (6.1 m)
Deck Width18.0 ft (5.5 m)
Deck Area372.4 sq m
Main Spans11
Year Built1950

Traffic

Avg Daily Traffic93 (2010)
Truck Traffic16%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number11C0016

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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