Structure 64003500000000 · Massac County, IL
Carries Interstate 24 over Ohio River, 1.5 Mi S US 45.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 5 of 9.
How ratings work5,621 ft end to end, longest span 730 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 arch.
| State | Illinois |
| County | Massac |
| Location | 1.5 Mi S US 45 |
| Carries | Interstate 24 |
| Crosses | Ohio River |
| Coordinates | 37.14002, -88.68481 |
| Material | Steel |
| Design | Arch - Thru |
| Total Length | 5621.4 ft (1713.4 m) |
| Max Span | 730.0 ft (222.5 m) |
| Deck Width | 65.9 ft (20.1 m) |
| Deck Area | 34439.3 sq m |
| Main Spans | 2 |
| Year Built | 1973 |
| Avg Daily Traffic | 31,400 (2024) |
| Truck Traffic | 26% |
| Lanes On Bridge | 4 |
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 064003500000000 |
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.