NB I-380 over San Marnan DR
Good Condition43 years old9,050 vehicles/day
Location
| State | Iowa |
| County | Black Hawk |
| Location | 1.1 Mi. N Of N Jct. US 20 |
| Carries | NB I-380 |
| Crosses | San Marnan DR |
| Coordinates | 42.46864, -92.31828 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 181.1 ft (55.2 m) |
| Max Span | 96.1 ft (29.3 m) |
| Deck Width | 55.1 ft (16.8 m) |
| Deck Area | 927.4 sq m |
| Main Spans | 3 |
| Year Built | 1983 |
Traffic
| Avg Daily Traffic | 9,050 (2022) |
| Truck Traffic | 14% |
| Lanes On Bridge | 3 |
| Lanes Under Bridge | 5 |
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 | 000000000605295 |