Structure 58062270 · Spink County, SD

175th Street over Turtle Creek

Carries 175th Street over Turtle Creek, 1s 2.8w Redfield.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructure6/9 · Satisfactory
Substructuresets the rating3/9 · Serious
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT98 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 6/9Substructure 3/9 · sets the rating

98 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.

Built1909117 years old
Length98.1 ft29.9 m
Daily traffic126counted 2022
Last inspectedSeptember 2024every 12 months

Location

StateSouth Dakota
CountySpink
Location1s 2.8w Redfield
Carries175th Street
CrossesTurtle Creek
Coordinates44.85057, -98.58186

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length98.1 ft (29.9 m)
Max Span96.1 ft (29.3 m)
Deck Width18.0 ft (5.5 m)
Deck Area164.4 sq m
Main Spans1
Year Built1909

Traffic

Avg Daily Traffic126 (2022)
Truck Traffic2%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour CriticalUnknown
Structure Number000000058062270

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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