Structure 58 0043R · Imperial County, CA

State Route 86 NB over Amerosa Ditch

Carries State Route 86 NB over Amerosa Ditch, 11-imp-086-57.33.

Overall conditionPoor

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

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating4/9 · Poor
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT39 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 4/9 · sets the ratingSubstructure 7/9

39 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 slab bridge.

Built198145 years old
Length39.0 ft11.9 m
Daily traffic7,300counted 2019
Last inspectedDecember 2023every 24 months

Location

StateCalifornia
CountyImperial
Location11-imp-086-57.33
CarriesState Route 86 NB
CrossesAmerosa Ditch
Coordinates33.29422, -115.97527

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length39.0 ft (11.9 m)
Max Span36.1 ft (11 m)
Deck Width43.0 ft (13.1 m)
Deck Area155.9 sq m
Main Spans1
Year Built1981

Traffic

Avg Daily Traffic7,300 (2019)
Truck Traffic40%
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number58 0043R

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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