Structure 35 0189 · San Mateo County, CA

State Route 92 over Foster City Lagoon

Carries State Route 92 over Foster City Lagoon, 04-sm-092-r13.83-fstc.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT521 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

521 ft end to end, longest span 52 ft: about 7 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 slab bridge.

Built1967rebuilt 1996
Length521.0 ft158.8 m
Daily traffic86,000counted 2009
Last inspectedAugust 2022every 48 months

Location

StateCalifornia
CountySan Mateo
Location04-sm-092-r13.83-fstc
CarriesState Route 92
CrossesFoster City Lagoon
Coordinates37.56612, -122.27034

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length521.0 ft (158.8 m)
Max Span51.8 ft (15.8 m)
Deck Width141.4 ft (43.1 m)
Deck Area6844.3 sq m
Main Spans18
Year Built1967 (reconstructed 1996)

Traffic

Avg Daily Traffic86,000 (2009)
Truck Traffic7%
Lanes On Bridge8

Inspection & Ownership

Last InspectionAugust 2022
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number35 0189

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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