Structure 35P0005 · San Mateo County, CA

Main Road over Little Butano Creek

Carries Main Road over Little Butano Creek, Butano ST Prk 0.4 Mi In.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
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 FT53 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 4/9 · sets the ratingSubstructure 7/9

53 ft end to end. 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 multi-beam bridge.

Built198046 years old
Length53.1 ft16.2 m
Daily traffic70counted 2018
Last inspectedApril 2024every 24 months

Location

StateCalifornia
CountySan Mateo
LocationButano ST Prk 0.4 Mi In
CarriesMain Road
CrossesLittle Butano Creek
Coordinates37.20608, -122.33465

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length53.1 ft (16.2 m)
Max Span49.9 ft (15.2 m)
Deck Width14.4 ft (4.4 m)
Deck Area71.3 sq m
Main Spans1
Year Built1980

Traffic

Avg Daily Traffic70 (2018)
Lanes On Bridge1

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Park/Forest Agency
Historical SignificanceHistorical significance is not determined
Scour CriticalUnknown
Structure Number35P0005

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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