Structure 6870 · Audrain County, MO
Carries RT O S over Elm Br, S 35 T 53 N R 8 W.
A culvert 21 ft across with 2 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 | Audrain |
| Location | S 35 T 53 N R 8 W |
| Carries | RT O S |
| Crosses | Elm Br |
| Coordinates | 39.33151, -91.76433 |
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 20.7 ft (6.3 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Width | 28.9 ft (8.8 m) |
| Deck Area | 55.4 sq m |
| Main Spans | 2 |
| Year Built | 1956 |
| Avg Daily Traffic | 195 (2024) |
| Truck Traffic | 13% |
| Lanes On Bridge | 2 |
| Last Inspection | October 2023 |
| 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 | 6870 |
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.