WB US 20 over N Fork Maquoketa River
Fair Condition68 years old5,450 vehicles/day
Location
| State | Iowa |
| County | Dubuque |
| Location | 0.6 Mi. W Of Jct. Ia 136 |
| Carries | WB US 20 |
| Crosses | N Fork Maquoketa River |
| Coordinates | 42.47029, -91.12380 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 5 (Fair) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Box Beam - Single/Spread |
| Total Length | 502.0 ft (153 m) |
| Max Span | 108.9 ft (33.2 m) |
| Deck Width | 33.5 ft (10.2 m) |
| Deck Area | 1560.6 sq m |
| Main Spans | 5 |
| Year Built | 1958 |
Traffic
| Avg Daily Traffic | 5,450 (2022) |
| Truck Traffic | 19% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 823 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is eligible for the National Register |
| Structure Number | 000000000023780 |