20th Avenue SE over Big Sioux River
Fair Condition16 years old3,464 vehicles/day
Location
| State | South Dakota |
| County | Codington |
| Location | 1.0s & 0.5e Of Watertown |
| Carries | 20th Avenue SE |
| Crosses | Big Sioux River |
| Coordinates | 44.87654, -97.09809 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 370.4 ft (112.9 m) |
| Max Span | 90.9 ft (27.7 m) |
| Deck Width | 42.7 ft (13 m) |
| Deck Area | 1467.7 sq m |
| Main Spans | 4 |
| Year Built | 2010 |
Traffic
| Avg Daily Traffic | 3,464 (2022) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 823 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000015196190 |