Structure 56118127 · Sanborn County, SD

Sd034 W over James Rv

Carries Sd034 W over James Rv, 0.9 SE Of Forestburg.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT332 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

332 ft end to end, longest span 107 ft: about 5 semi-trucks nose to tail. Lengths and the semi-truck 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.

Built200323 years old
Length332.0 ft101.2 m
Daily traffic1,484counted 2024
Last inspectedFebruary 2024every 48 months

Location

StateSouth Dakota
CountySanborn
Location0.9 SE Of Forestburg
CarriesSd034 W
CrossesJames Rv
Coordinates44.01323, -98.09443

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length332.0 ft (101.2 m)
Max Span107.3 ft (32.7 m)
Deck Width38.7 ft (11.8 m)
Deck Area1194.2 sq m
Main Spans3
Year Built2003

Traffic

Avg Daily Traffic1,484 (2024)
Truck Traffic13%
Lanes On Bridge2

Inspection & Ownership

Last InspectionFebruary 2024
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000056118127

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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