405th Avenue over North Br Twelve Mile Ck
Fair Condition103 years old85 vehicles/day
Location
| State | South Dakota |
| County | Davison |
| Location | 6.0 W & 0.5 S Ethan |
| Carries | 405th Avenue |
| Crosses | North Br Twelve Mile Ck |
| Coordinates | 43.53879, -98.10451 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | Unknown |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Tee Beam |
| Total Length | 40.0 ft (12.2 m) |
| Max Span | 40.0 ft (12.2 m) |
| Deck Width | 30.8 ft (9.4 m) |
| Deck Area | 114.7 sq m |
| Main Spans | 1 |
| Year Built | 1923 (reconstructed 1986) |
Traffic
| Avg Daily Traffic | 85 (2022) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 824 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000018110213 |