Structure 8401300000000 · Carroll County, IL
Carries Tr-34 Thomsonrdspu over Branch Johnson Creek, 2.5m E Of Thomson.
A culvert 24 ft across with 3 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 | Illinois |
| County | Carroll |
| Location | 2.5m E Of Thomson |
| Carries | Tr-34 Thomsonrdspu |
| Crosses | Branch Johnson Creek |
| Coordinates | 41.96007, -90.04648 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 23.6 ft (7.2 m) |
| Max Span | 6.9 ft (2.1 m) |
| Deck Area | 37.4 sq m |
| Main Spans | 3 |
| Year Built | 1997 |
| Avg Daily Traffic | 50 (2021) |
| Lanes On Bridge | 2 |
| Last Inspection | April 2024 |
| Inspection Frequency | Every 24 months |
| Owner | Town/Township Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 008401300000000 |
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.