Structure 37 0267 · Santa Clara County, CA

Bird Avenue over S280-87 I280 87-n280

Carries Bird Avenue over S280-87 I280 87-n280, 04-scl-280-r2.87-sjs.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating5/9 · Fair
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT289 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 5/9 · sets the ratingSubstructure 7/9

289 ft end to end, longest span 150 ft: about 4 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.

Built196957 years old
Length289.0 ft88.1 m
Daily traffic15,300counted 2002
Last inspectedFebruary 2025every 24 months

Location

StateCalifornia
CountySanta Clara
Location04-scl-280-r2.87-sjs
CarriesBird Avenue
CrossesS280-87 I280 87-n280
Coordinates37.32203, -121.89786

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignBox Beam - Multiple
Total Length289.0 ft (88.1 m)
Max Span149.9 ft (45.7 m)
Deck Width119.1 ft (36.3 m)
Deck Area3198.0 sq m
Main Spans2
Year Built1969

Traffic

Avg Daily Traffic15,300 (2002)
Truck Traffic2%
Lanes On Bridge8
Lanes Under Bridge12

Inspection & Ownership

Last InspectionFebruary 2025
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number37 0267

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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