Structure 37 0410H · Santa Clara County, CA

I280-n87 & N87-off over City Strs & Guadalupe Rv

Carries I280-n87 & N87-off over City Strs & Guadalupe Rv, 04-scl-280-r2.54-sjs.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,788 FT OVERALL250 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

1,788 ft end to end, longest span 188 ft: about 5.0 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.

Built198838 years old
Length1788.4 ft545.1 m
Daily traffic14,500counted 1998
Last inspectedJanuary 2025every 48 months

Location

StateCalifornia
CountySanta Clara
Location04-scl-280-r2.54-sjs
CarriesI280-n87 & N87-off
CrossesCity Strs & Guadalupe Rv
Coordinates37.32881, -121.89498

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignBox Beam - Multiple
Total Length1788.4 ft (545.1 m)
Max Span188.0 ft (57.3 m)
Deck Width42.0 ft (12.8 m)
Deck Area6977.3 sq m
Main Spans11
Year Built1988

Traffic

Avg Daily Traffic14,500 (1998)
Truck Traffic2%
Lanes On Bridge3
Lanes Under Bridge12

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number37 0410H

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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