Structure 8230 · Clayton County, IA
Carries 6th ST over Drainage, M18000800.
22 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 slab bridge.
| State | Iowa |
| County | Clayton |
| Location | M18000800 |
| Carries | 6th ST |
| Crosses | Drainage |
| Coordinates | 43.01987, -91.18154 |
| Material | Concrete |
| Design | Slab |
| Total Length | 22.0 ft (6.7 m) |
| Max Span | 22.0 ft (6.7 m) |
| Deck Width | 25.9 ft (7.9 m) |
| Deck Area | 52.9 sq m |
| Main Spans | 1 |
| Year Built | 1920 |
| Avg Daily Traffic | 242 (2022) |
| Lanes On Bridge | 2 |
| Last Inspection | April 2010 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 7 — Countermeasures installed |
| Structure Number | 000000000008230 |
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.