Structure 34 0071F · San Francisco County, CA

S101-s280 Connecto over 280/101 Ic -alemany BLVD

Carries S101-s280 Connecto over 280/101 Ic -alemany BLVD, 04-sf-101-1.94-sf.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,256 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

1,256 ft end to end, longest span 100 ft: about 3.5 football fields. 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.

Built196066 years old
Length1255.9 ft382.8 m
Daily traffic56,000counted 2019
Last inspectedJanuary 2024every 24 months

Location

StateCalifornia
CountySan Francisco
Location04-sf-101-1.94-sf
CarriesS101-s280 Connecto
Crosses280/101 Ic -alemany BLVD
Coordinates37.73486, -122.40972

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length1255.9 ft (382.8 m)
Max Span100.1 ft (30.5 m)
Deck Width37.7 ft (11.5 m)
Deck Area4402.2 sq m
Main Spans14
Year Built1960

Traffic

Avg Daily Traffic56,000 (2019)
Truck Traffic4%
Lanes On Bridge2
Lanes Under Bridge9

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number34 0071F

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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