Structure 316435 · Story County, IA
Carries 140th ST over Drainage Ditch, 085242701.
Set by its lowest-rated component: Deck and Substructure at 6 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 | Story |
| Location | 085242701 |
| Carries | 140th ST |
| Crosses | Drainage Ditch |
| Coordinates | 42.15181, -93.62447 |
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 20.0 ft (6.1 m) |
| Max Span | 18.0 ft (5.5 m) |
| Deck Width | 24.0 ft (7.3 m) |
| Deck Area | 44.5 sq m |
| Main Spans | 1 |
| Year Built | 1963 (reconstructed 1974) |
| Avg Daily Traffic | 34 (2022) |
| Truck Traffic | 29% |
| Lanes On Bridge | 1 |
| Last Inspection | November 2022 |
| 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 | 000000000316435 |
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.