Structure 8800016S0000000 · Mariposa County, CA

Chowchilla Road over Big Creek

Carries Chowchilla Road over Big Creek, Approx. 2.5 Miles SW Of W.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructure5/9 · Fair
Substructure5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT41 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 5/9Substructure 5/9

41 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.

Built194086 years old
Length41.0 ft12.5 m
Daily traffic20counted 2019
Last inspectedSeptember 2024every 24 months

Location

StateCalifornia
CountyMariposa
LocationApprox. 2.5 Miles SW Of W
CarriesChowchilla Road
CrossesBig Creek
Coordinates37.51568, -119.66567

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length41.0 ft (12.5 m)
Max Span37.1 ft (11.3 m)
Deck Width16.1 ft (4.9 m)
Deck Area61.2 sq m
Main Spans1
Year Built1940

Traffic

Avg Daily Traffic20 (2019)
Truck Traffic1%
Lanes On Bridge1

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerNational Park Service
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number8800016S0000000

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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