Structure 203460 · Johnson County, IA
Carries SW 480th ST over Br Dirty Face CR, 078071101.
Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.
How ratings work20 ft end to end. 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 or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.
| State | Iowa |
| County | Johnson |
| Location | 078071101 |
| Carries | SW 480th ST |
| Crosses | Br Dirty Face CR |
| Coordinates | 41.58323, -91.62573 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 20.0 ft (6.1 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 27.9 ft (8.5 m) |
| Deck Area | 51.9 sq m |
| Main Spans | 1 |
| Year Built | 1920 |
| Avg Daily Traffic | 61 (2021) |
| Lanes On Bridge | 1 |
| Last Inspection | April 2023 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 000000000203460 |
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.