Structure 35 0232R · San Mateo County, CA

Interstate 280 NB over SR 84 (woodside Exp)

Carries Interstate 280 NB over SR 84 (woodside Exp), 04-sm-280-r3.32-wds.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT158 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 7/9

158 ft end to end: about 2 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
Length158.1 ft48.2 m
Daily traffic50,500counted 2009
Last inspectedOctober 2023every 24 months

Location

StateCalifornia
CountySan Mateo
Location04-sm-280-r3.32-wds
CarriesInterstate 280 NB
CrossesSR 84 (woodside Exp)
Coordinates37.43531, -122.24284

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length158.1 ft (48.2 m)
Max Span154.9 ft (47.2 m)
Deck Width69.6 ft (21.2 m)
Deck Area1021.8 sq m
Main Spans1
Year Built1969

Traffic

Avg Daily Traffic50,500 (2009)
Truck Traffic3%
Lanes On Bridge4
Lanes Under Bridge6

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number35 0232R

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.

Nearby Bridges