Structure 3330274 · Beadle County, SD

409th Avenue over S. Fork Of Pearl Creek

Carries 409th Avenue over S. Fork Of Pearl Creek, 9.4s Of Cavour.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 3 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating3/9 · Serious
Substructure4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT73 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 3/9 · sets the ratingSubstructure 4/9

73 ft end to end, longest span 24 ft. 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.

Built1935rebuilt 1974
Length73.2 ft22.3 m
Daily traffic120counted 2022
Last inspectedAugust 2023every 12 months

Location

StateSouth Dakota
CountyBeadle
Location9.4s Of Cavour
Carries409th Avenue
CrossesS. Fork Of Pearl Creek
Coordinates44.23337, -98.03396

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length73.2 ft (22.3 m)
Max Span24.0 ft (7.3 m)
Deck Width27.9 ft (8.5 m)
Deck Area189.6 sq m
Main Spans3
Year Built1935 (reconstructed 1974)

Traffic

Avg Daily Traffic120 (2022)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalUnknown
Structure Number000000003330274

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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