A50 (bridge St) over Big Sioux River
Fair Condition55 years old888 vehicles/day
Location
| State | Iowa |
| County | Lyon |
| Location | 098492519 |
| Carries | A50 (bridge St) |
| Crosses | Big Sioux River |
| Coordinates | 43.28146, -96.57835 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 7 (Good) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 348.1 ft (106.1 m) |
| Max Span | 98.1 ft (29.9 m) |
| Deck Width | 32.2 ft (9.8 m) |
| Deck Area | 1039.8 sq m |
| Main Spans | 4 |
| Year Built | 1971 |
Traffic
| Avg Daily Traffic | 888 (2022) |
| Truck Traffic | 12% |
| 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 | 000000000229541 |