Structure 79600100000000 · Randolph County, IL
Carries Ill 150 over Miss Riv/fau 9416, At Chester - Modot.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 4 of 9.
How ratings work2,827 ft end to end, longest span 670 ft: about 7.9 football fields. Lengths and the semi-truck on the deck are drawn to the same scale. 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 | Illinois |
| County | Randolph |
| Location | At Chester - Modot |
| Carries | Ill 150 |
| Crosses | Miss Riv/fau 9416 |
| Coordinates | 37.90253, -89.83692 |
| Material | Steel Continuous |
| Design | Truss - Thru |
| Total Length | 2827.1 ft (861.7 m) |
| Max Span | 669.9 ft (204.2 m) |
| Deck Width | 22.6 ft (6.9 m) |
| Deck Area | 5945.7 sq m |
| Main Spans | 6 |
| Year Built | 1942 (reconstructed 1946) |
| Avg Daily Traffic | 6,250 (2023) |
| Truck Traffic | 16% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 2 |
| Last Inspection | February 2024 |
| Inspection Frequency | Every 12 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is eligible for the National Register |
| Scour Critical | 3 — Scour critical |
| Structure Number | 079600100000000 |
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.