181st Street over Big Sioux River
Good Condition10 years old66 vehicles/day
Location
| State | South Dakota |
| County | Hamlin |
| Location | 2n & 1.2w Of Castlewood |
| Carries | 181st Street |
| Crosses | Big Sioux River |
| Coordinates | 44.76074, -97.05000 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 8 (Very Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 96.1 ft (29.3 m) |
| Max Span | 91.9 ft (28 m) |
| Deck Width | 32.2 ft (9.8 m) |
| Deck Area | 287.1 sq m |
| Main Spans | 1 |
| Year Built | 2016 |
Traffic
| Avg Daily Traffic | 66 (2022) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000029218030 |