State HWY 47 over Big Bend Dam Powerhouse
Fair Condition62 years old454 vehicles/day
Location
| State | South Dakota |
| County | Lyman |
| Location | 2 Mi. So. Of Ft. Thompson |
| Carries | State HWY 47 |
| Crosses | Big Bend Dam Powerhouse |
| Coordinates | 44.03864, -99.44659 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 794.6 ft (242.2 m) |
| Max Span | 109.9 ft (33.5 m) |
| Deck Width | 35.1 ft (10.7 m) |
| Deck Area | 2591.5 sq m |
| Main Spans | 9 |
| Year Built | 1964 |
Traffic
| Avg Daily Traffic | 454 (2023) |
| Truck Traffic | 32% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 923 |
| Inspection Frequency | Every 24 months |
| Owner | Corps of Engineers |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | CEPMROSD0000007 |