Structure 21C0044 · Napa County, CA

Main Street over Napa Creek

Carries Main Street over Napa Creek, Southeast Pearl ST.

Overall conditionFair

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

How ratings work
Superstructure7/9 · Good
Substructuresets the rating5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT55 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck not ratedSuperstructure 7/9Substructure 5/9 · sets the rating

55 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 deck arch.

Built1860rebuilt 1985
Length55.1 ft16.8 m
Daily traffic5,972counted 2017
Last inspectedAugust 2023every 24 months

Location

StateCalifornia
CountyNapa
LocationSoutheast Pearl ST
CarriesMain Street
CrossesNapa Creek
Coordinates38.29988, -122.28598

Physical Characteristics

MaterialMasonry
DesignArch - Deck
Total Length55.1 ft (16.8 m)
Max Span41.0 ft (12.5 m)
Deck Width36.4 ft (11.1 m)
Deck Area186.5 sq m
Main Spans1
Year Built1860 (reconstructed 1985)

Traffic

Avg Daily Traffic5,972 (2017)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number21C0044

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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