Structure 20 0205G · Sonoma County, CA

E12-n&s101 Connctr over Olive Street

Carries E12-n&s101 Connctr over Olive Street, 04-son-012-r15.70-sro.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT155 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

155 ft end to end, longest span 68 ft: about 2 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 box-beam bridge.

Built1964rebuilt 2009
Length155.2 ft47.3 m
Daily traffic47,400counted 2014
Last inspectedSeptember 2024every 48 months

Location

StateCalifornia
CountySonoma
Location04-son-012-r15.70-sro
CarriesE12-n&s101 Connctr
CrossesOlive Street
Coordinates38.43240, -122.71926

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length155.2 ft (47.3 m)
Max Span67.9 ft (20.7 m)
Deck Width42.7 ft (13 m)
Deck Area614.9 sq m
Main Spans3
Year Built1964 (reconstructed 2009)

Traffic

Avg Daily Traffic47,400 (2014)
Truck Traffic4%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number20 0205G

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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