US 18 over Mississippi River Ia 76
Fair Condition52 years old10,100 vehicles/day
Location
| State | Iowa |
| County | Clayton |
| Location | In Marquette |
| Carries | US 18 |
| Crosses | Mississippi River Ia 76 |
| Coordinates | 43.04387, -91.17836 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel |
| Design | Arch - Thru |
| Total Length | 2561.0 ft (780.6 m) |
| Max Span | 461.9 ft (140.8 m) |
| Deck Width | 44.0 ft (13.4 m) |
| Deck Area | 10460.0 sq m |
| Main Spans | 1 |
| Year Built | 1974 |
Traffic
| Avg Daily Traffic | 10,100 (2022) |
| Truck Traffic | 12% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 2 |
Inspection & Ownership
| Last Inspection | 823 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000020515 |