Structure 48B00024N · Harlan County, KY
Carries Us-421 over Mills Branch, 1.0 Mi East Of Jct Ky 568.
A culvert 20 ft across with 2 openings. 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, so those are drawn as typical for a culvert.
| State | Kentucky |
| County | Harlan |
| Location | 1.0 Mi East Of Jct Ky 568 |
| Carries | Us-421 |
| Crosses | Mills Branch |
| Coordinates | 36.76500, -83.15056 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 20.0 ft (6.1 m) |
| Max Span | 7.9 ft (2.4 m) |
| Deck Area | 37.2 sq m |
| Main Spans | 2 |
| Year Built | 1934 |
| Avg Daily Traffic | 1,251 (2023) |
| Truck Traffic | 20% |
| Lanes On Bridge | 2 |
| Last Inspection | June 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 048B00024N |
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.