Structure 35 0250L · San Mateo County, CA

Interstate 280 SB over Edgewood Road

Carries Interstate 280 SB over Edgewood Road, 04-sm-280-6.65.

Overall conditionFair

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

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT199 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 7/9

199 ft end to end, longest span 100 ft: about 3 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.

Built197353 years old
Length199.1 ft60.7 m
Daily traffic50,000counted 2009
Last inspectedOctober 2023every 24 months

Location

StateCalifornia
CountySan Mateo
Location04-sm-280-6.65
CarriesInterstate 280 SB
CrossesEdgewood Road
Coordinates37.46824, -122.29223

Physical Characteristics

MaterialConcrete Continuous
DesignBox Beam - Multiple
Total Length199.1 ft (60.7 m)
Max Span99.7 ft (30.4 m)
Deck Width88.6 ft (27 m)
Deck Area1638.9 sq m
Main Spans2
Year Built1973

Traffic

Avg Daily Traffic50,000 (2009)
Truck Traffic3%
Lanes On Bridge5
Lanes Under Bridge4

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 0250L

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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