Structure 50019100000000 · LaSalle County, IL
Carries I-39 US 51 over Il Rv/il 351/ Bo Rr, 2.82 Mi S Of I-80.
7,121 ft end to end: about 20 football fields, or 1.3 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 | LaSalle |
| Location | 2.82 Mi S Of I-80 |
| Carries | I-39 US 51 |
| Crosses | Il Rv/il 351/ Bo Rr |
| Coordinates | 41.31049, -89.08283 |
| Material | Steel |
| Design | Arch - Thru |
| Total Length | 7121.1 ft (2170.5 m) |
| Max Span | 620.4 ft (189.1 m) |
| Deck Width | 86.6 ft (26.4 m) |
| Deck Area | 57301.2 sq m |
| Main Spans | 1 |
| Year Built | 1984 (reconstructed 2007) |
| Avg Daily Traffic | 19,400 (2023) |
| Truck Traffic | 38% |
| Lanes On Bridge | 4 |
| Lanes Under Bridge | 2 |
| Last Inspection | August 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 050019100000000 |
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.