NB I-29 over Big Sioux River
Fair Condition63 years old17,650 vehicles/day
Location
| State | Iowa |
| County | Woodbury |
| Location | South Dakota State Line |
| Carries | NB I-29 |
| Crosses | Big Sioux River |
| Coordinates | 42.49507, -96.47609 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 560.0 ft (170.7 m) |
| Max Span | 225.1 ft (68.6 m) |
| Deck Width | 36.1 ft (11 m) |
| Deck Area | 1877.7 sq m |
| Main Spans | 3 |
| Year Built | 1963 |
Traffic
| Avg Daily Traffic | 17,650 (2022) |
| Truck Traffic | 17% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 423 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000053930 |