Structure 35C0095 · San Mateo County, CA

Tartan Trail RD over San Mateo Creek

Carries Tartan Trail RD over San Mateo Creek, West Crystal Springs RD.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Superstructuresets the rating4/9 · Poor
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT32 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck not ratedSuperstructure 4/9 · sets the ratingSubstructure 7/9

32 ft end to end, longest span 15 ft. Lengths and the car 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 deck arch.

Built196462 years old
Length32.2 ft9.8 m
Daily traffic1,887counted 2015
Last inspectedMay 2023every 24 months

Location

StateCalifornia
CountySan Mateo
LocationWest Crystal Springs RD
CarriesTartan Trail RD
CrossesSan Mateo Creek
Coordinates37.53680, -122.34990

Physical Characteristics

MaterialSteel
DesignArch - Deck
Total Length32.2 ft (9.8 m)
Max Span15.4 ft (4.7 m)
Deck Area77.4 sq m
Main Spans2
Year Built1964

Traffic

Avg Daily Traffic1,887 (2015)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number35C0095

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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