Structure 41156169 · Lawrence County, SD

Us085 over Whitewood Ck

Carries Us085 over Whitewood Ck, 0.1 NE Jct US 385.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT54 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 8/9Substructure 6/9 · sets the rating

54 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.

Built199333 years old
Length54.5 ft16.6 m
Daily traffic5,939counted 2024
Last inspectedMarch 2024every 24 months

Location

StateSouth Dakota
CountyLawrence
Location0.1 NE Jct US 385
CarriesUs085
CrossesWhitewood Ck
Coordinates44.35906, -103.73913

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length54.5 ft (16.6 m)
Max Span51.8 ft (15.8 m)
Deck Width54.5 ft (16.6 m)
Deck Area275.6 sq m
Main Spans1
Year Built1993

Traffic

Avg Daily Traffic5,939 (2024)
Truck Traffic8%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMarch 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000041156169

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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