Structure 16540 · Butler County, IA
Carries Ia 3 over Stream, 1.5 Mi. W Of Jct. Ia #188.
A culvert 21 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 | Butler |
| Location | 1.5 Mi. W Of Jct. Ia #188 |
| Carries | Ia 3 |
| Crosses | Stream |
| Coordinates | 42.74469, -92.69163 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Area | 85.8 sq m |
| Main Spans | 2 |
| Year Built | 1967 (reconstructed 1999) |
| Avg Daily Traffic | 2,390 (2022) |
| Truck Traffic | 15% |
| Lanes On Bridge | 2 |
| Last Inspection | March 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 | 000000000016540 |
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.