161 AVE (fas 6121) over I090
Fair Condition65 years old886 vehicles/day
Location
| State | South Dakota |
| County | Pennington |
| Location | New Underwood Interchange |
| Carries | 161 AVE (fas 6121) |
| Crosses | I090 |
| Coordinates | 44.10389, -102.82917 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 253.9 ft (77.4 m) |
| Max Span | 64.0 ft (19.5 m) |
| Deck Width | 34.4 ft (10.5 m) |
| Deck Area | 812.7 sq m |
| Main Spans | 4 |
| Year Built | 1961 |
Traffic
| Avg Daily Traffic | 886 (2023) |
| Truck Traffic | 1% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 4 |
Inspection & Ownership
| Last Inspection | 523 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000052610285 |