Structure 37 0225R · Santa Clara County, CA

NB Interstate 280 over Magdalena Avenue

Carries NB Interstate 280 over Magdalena Avenue, 04-scl-280-14.10.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT137 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

137 ft end to end, longest span 71 ft. 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.

Built196759 years old
Length137.1 ft41.8 m
Daily traffic58,500counted 2009
Last inspectedFebruary 2022every 48 months

Location

StateCalifornia
CountySanta Clara
Location04-scl-280-14.10
CarriesNB Interstate 280
CrossesMagdalena Avenue
Coordinates37.35290, -122.10693

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length137.1 ft (41.8 m)
Max Span70.9 ft (21.6 m)
Deck Width69.6 ft (21.2 m)
Deck Area886.2 sq m
Main Spans2
Year Built1967

Traffic

Avg Daily Traffic58,500 (2009)
Truck Traffic2%
Lanes On Bridge4
Lanes Under Bridge4

Inspection & Ownership

Last InspectionFebruary 2022
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number37 0225R

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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