Structure 47790 · Shelby County, IA
Carries US 59 over Drainage Ditch, 2.8 Mi. S Of Jct. Ia 44.
A culvert 25 ft across with 2 openings. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.
| State | Iowa |
| County | Shelby |
| Location | 2.8 Mi. S Of Jct. Ia 44 |
| Carries | US 59 |
| Crosses | Drainage Ditch |
| Coordinates | 41.60649, -95.33496 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 12.1 ft (3.7 m) |
| Deck Area | 101.8 sq m |
| Main Spans | 2 |
| Year Built | 1966 |
| Avg Daily Traffic | 5,000 (2023) |
| Truck Traffic | 18% |
| Lanes On Bridge | 2 |
| Last Inspection | July 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 000000000047790 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.