Structure 27C0054 · Marin County, CA

Alexander Avenue over East Road

Carries Alexander Avenue over East Road, 1.3 Km East Of SR 101.

Overall conditionFair

Set by its lowest-rated component: Substructure at 5 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
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 5/9 · sets the rating

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 tee-beam bridge.

Built193789 years old
Length39.0 ft11.9 m
Daily traffic7,201counted 2024
Last inspectedMarch 2024every 24 months

Location

StateCalifornia
CountyMarin
Location1.3 Km East Of SR 101
CarriesAlexander Avenue
CrossesEast Road
Coordinates37.84341, -122.47829

Physical Characteristics

MaterialConcrete
DesignTee Beam
Total Length39.0 ft (11.9 m)
Max Span34.1 ft (10.4 m)
Deck Width39.4 ft (12 m)
Deck Area142.8 sq m
Main Spans1
Year Built1937

Traffic

Avg Daily Traffic7,201 (2024)
Truck Traffic2%
Lanes On Bridge2
Lanes Under Bridge1

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerLocal Toll Authority
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour CriticalNot applicable
Structure Number27C0054

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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