Structure 50206020 · Minnehaha County, SD

Sd115 over Big Sioux Rv

Carries Sd115 over Big Sioux Rv, 0.2 S Of Dell Rapids.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · 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
SEMI-TRUCK · 72 FT431 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

431 ft end to end, longest span 110 ft: about 6 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.

Built20188 years old
Length430.8 ft131.3 m
Daily traffic3,514counted 2024
Last inspectedOctober 2024every 48 months

Location

StateSouth Dakota
CountyMinnehaha
Location0.2 S Of Dell Rapids
CarriesSd115
CrossesBig Sioux Rv
Coordinates43.82041, -96.71675

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length430.8 ft (131.3 m)
Max Span109.9 ft (33.5 m)
Deck Width56.8 ft (17.3 m)
Deck Area2271.5 sq m
Main Spans4
Year Built2018

Traffic

Avg Daily Traffic3,514 (2024)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000050206020

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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