Structure 24 · Shelby County, AL

Cahaba Beach Road over Little Cahaba River

Carries Cahaba Beach Road over Little Cahaba River, 1.8 Miles North Of US 280.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 2 of 9.

How ratings work
Deck5/9 · Fair
Superstructuresets the rating2/9 · Critical
Substructure5/9 · Fair
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT110 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 2/9 · sets the ratingSubstructure 5/9

110 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 through truss.

Built1904122 years old
Length109.9 ft33.5 m
Daily traffic100counted 1996
Last inspectedOctober 2019every 24 months

Location

StateAlabama
CountyShelby
Location1.8 Miles North Of US 280
CarriesCahaba Beach Road
CrossesLittle Cahaba River
Coordinates33.43977, -86.69927

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length109.9 ft (33.5 m)
Max Span109.9 ft (33.5 m)
Deck Width11.5 ft (3.5 m)
Deck Area117.2 sq m
Main Spans1
Year Built1904

Traffic

Avg Daily Traffic100 (1996)
Truck Traffic1%
Lanes On Bridge1

Inspection & Ownership

Last InspectionOctober 2019
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is possibly eligible (requires evaluation)
Scour Critical6 — Scour calculated, stable
Structure Number000024

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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