Structure 4B00021N · Ballard County, KY
Carries Us-51 over Ohio River -ic (sou) Rr, 4.0 Mi West Of Jct Us51&6.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 5 of 9.
How ratings work5,865 ft end to end, longest span 800 ft: about 16 football fields, or 1.1 miles. 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 through truss.
| State | Kentucky |
| County | Ballard |
| Location | 4.0 Mi West Of Jct Us51&6 |
| Carries | Us-51 |
| Crosses | Ohio River -ic (sou) Rr |
| Coordinates | 36.99472, -89.14472 |
| Material | Steel |
| Design | Truss - Thru |
| Total Length | 5865.2 ft (1787.7 m) |
| Max Span | 799.9 ft (243.8 m) |
| Deck Width | 24.0 ft (7.3 m) |
| Deck Area | 13050.2 sq m |
| Main Spans | 5 |
| Year Built | 1937 |
| Avg Daily Traffic | 5,344 (2022) |
| Truck Traffic | 44% |
| Lanes On Bridge | 2 |
| Last Inspection | August 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is eligible for the National Register |
| Scour Critical | 4 — Foundations need monitoring |
| Structure Number | 004B00021N |
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.