Gentian Trail over Blackbird CR
Putnam County, Missouri · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Gentian Trail over Blackbird CR in Putnam County, Missouri, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1999, making it 26 years old at the 2025 inventory.
- It carries about 40 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 109 of the 214 inventoried bridges in Putnam County rated good (50.9%); 32 (15.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated February 2023, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (40.39587, -92.78581)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 110 ft |
| Location | S 34 T 65 N R 17 W |
| NBI structure number | 20791 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | February 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Putnam County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mo 5 S over Blackbird CR | 2010 | 1,494 | Good |
| US 136 W over E Locust CR | 2010 | 1,492 | Good |
| US 136 E over Tanyard Br | 1931 | 1,492 | Fair |
| US 136 E over Barber CR | 2002 | 1,247 | Fair |
| US 136 E over Old Chariton Rvr | 2008 | 1,183 | Fair |
| US 136 E over Shoal CR | 1966 | 1,146 | Good |
All bridges nearby: Putnam County, MO bridge conditions · every bridge in Putnam County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.