Structure 74260 · Black Hawk County, IA
Carries Hess RD over Trib To Miller Creek, 87-13-12-02-20.
20 ft end to end, longest span 10 ft. 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 | Black Hawk |
| Location | 87-13-12-02-20 |
| Carries | Hess RD |
| Crosses | Trib To Miller Creek |
| Coordinates | 42.36327, -92.31815 |
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 20.0 ft (6.1 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Width | 26.6 ft (8.1 m) |
| Deck Area | 49.4 sq m |
| Main Spans | 2 |
| Year Built | 1960 |
| Avg Daily Traffic | 29 (2022) |
| Lanes On Bridge | 2 |
| Last Inspection | November 2023 |
| Inspection Frequency | Every 12 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 000000000074260 |
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.