Structure 16956 · St. Charles County, MO
Carries Portage RD over Flood Chnl, S 35 T 48 N R 6 E.
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 | Missouri |
| County | St. Charles |
| Location | S 35 T 48 N R 6 E |
| Carries | Portage RD |
| Crosses | Flood Chnl |
| Coordinates | 38.92964, -90.36695 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 6.9 ft (2.1 m) |
| Deck Width | 29.9 ft (9.1 m) |
| Deck Area | 66.4 sq m |
| Main Spans | 3 |
| Year Built | 1994 |
| Avg Daily Traffic | 192 (2024) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
| Last Inspection | February 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 16956 |
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.