Structure 15216220 · Codington County, SD

176 Street over Big Sioux Rv

Carries 176 Street over Big Sioux Rv, 4.0s 2.6e Watertown.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 4 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating4/9 · Poor
Substructure5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT112 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 4/9 · sets the ratingSubstructure 5/9

112 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 tee-beam bridge.

Built197155 years old
Length111.9 ft34.1 m
Daily traffic468counted 2022
Last inspectedJune 2024every 12 months

Location

StateSouth Dakota
CountyCodington
Location4.0s 2.6e Watertown
Carries176 Street
CrossesBig Sioux Rv
Coordinates44.83301, -97.05595

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length111.9 ft (34.1 m)
Max Span49.9 ft (15.2 m)
Deck Width31.5 ft (9.6 m)
Deck Area327.4 sq m
Main Spans1
Year Built1971

Traffic

Avg Daily Traffic468 (2022)
Truck Traffic2%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number000000015216220

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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