A18 (140th St) over Big Sioux River
Fair Condition63 years old1,607 vehicles/day
Location
| State | Iowa |
| County | Lyon |
| Location | 100493503 |
| Carries | A18 (140th St) |
| Crosses | Big Sioux River |
| Coordinates | 43.44800, -96.60148 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 400.9 ft (122.2 m) |
| Max Span | 87.9 ft (26.8 m) |
| Deck Width | 29.9 ft (9.1 m) |
| Deck Area | 1112.0 sq m |
| Main Spans | 5 |
| Year Built | 1963 |
Traffic
| Avg Daily Traffic | 1,607 (2022) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 723 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000231610 |