Old "tt" Rd over Trib of Isle Duboi
Ste. Genevieve County, Missouri · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Old "tt" Rd over Trib of Isle Duboi in Ste. Genevieve County, Missouri, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1924, making it 101 years old at the 2025 inventory.
- It carries about 15 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 11 of the 104 inventoried bridges in Ste. Genevieve County rated poor (10.6%); 11 (10.6%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (38.08121, -90.29096)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 4 | Poor condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 111 ft |
| Location | S 19 T 39 N R 6 E |
| NBI structure number | 17049 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Ste. Genevieve County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 55 S over Amburster CR | 1970 | 27,080 | Good |
| Is 55 S over Saline CR | 1969 | 23,236 | Fair |
| Is 55 S over Isle Dubois CR | 1970 | 13,572 | Good |
| Is 55 N over Isle Dubois CR | 1970 | 13,508 | Fair |
| Is 55 N over Isle Dubois CR | 1970 | 13,508 | Fair |
| Is 55 S over Fourche CR | 1970 | 13,211 | Fair |
All bridges nearby: Ste. Genevieve County, MO bridge conditions · every bridge in Ste. Genevieve County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.