Structure 37 0270H · Santa Clara County, CA

N&s I280 - N&s 87 over I 280 & SR 87 ST & Rmps

Carries N&s I280 - N&s 87 over I 280 & SR 87 ST & Rmps, 04-scl-280-r2.50-sjs.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT2,038 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 8/9

2,038 ft end to end, longest span 160 ft: about 5.7 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.

Built197155 years old
Length2038.1 ft621.2 m
Daily traffic41,400counted 1998
Last inspectedJanuary 2025every 48 months

Location

StateCalifornia
CountySanta Clara
Location04-scl-280-r2.50-sjs
CarriesN&s I280 - N&s 87
CrossesI 280 & SR 87 ST & Rmps
Coordinates37.32496, -121.88993

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length2038.1 ft (621.2 m)
Max Span160.1 ft (48.8 m)
Deck Width41.0 ft (12.5 m)
Deck Area7,765 sq m
Main Spans41
Year Built1971

Traffic

Avg Daily Traffic41,400 (1998)
Truck Traffic2%
Lanes On Bridge2
Lanes Under Bridge30

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number37 0270H

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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