Structure 35C0140L · San Mateo County, CA

Road-1 North over Mcdonnell RD

Carries Road-1 North over Mcdonnell RD, East Of SH 101.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT126 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

126 ft end to end, longest span 48 ft. 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 slab bridge.

Built197056 years old
Length126.0 ft38.4 m
Daily traffic31,980counted 2010
Last inspectedJanuary 2024every 48 months

Location

StateCalifornia
CountySan Mateo
LocationEast Of SH 101
CarriesRoad-1 North
CrossesMcdonnell RD
Coordinates37.61466, -122.39341

Physical Characteristics

MaterialPrestressed Concrete Continuous
DesignSlab
Total Length126.0 ft (38.4 m)
Max Span47.9 ft (14.6 m)
Deck Width80.1 ft (24.4 m)
Deck Area937.0 sq m
Main Spans4
Year Built1970

Traffic

Avg Daily Traffic31,980 (2010)
Truck Traffic5%
Lanes On Bridge4
Lanes Under Bridge4

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 48 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number35C0140L

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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