Is 229 N over US 59 Cst Atchison St
Buchanan County, Missouri · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Is 229 N over US 59 Cst Atchison St in Buchanan County, Missouri, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1979 and reconstructed in 2022, making it 46 years old at the 2025 inventory.
- It carries about 3,331 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 149 of the 246 inventoried bridges in Buchanan County rated fair (60.6%); 19 (7.7%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (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.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (39.73947, -94.85147)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 1,683 ft |
| Location | S 20 T 57 N R 35 W |
| NBI structure number | 2600 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| 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 |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Missouri department of transportation.
Busiest bridges in Buchanan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Is 29 S over Bee CR Br | 1958 | 35,463 | Fair |
| 6TH St-us 59 over BNSF RR | 1983 | 23,450 | Fair |
| Is 29 S over US 36 | 1958 | 21,784 | Fair |
| Is 29 N over US 36 | 1958 | 20,343 | Fair |
| Is 29 N over Cst Easton Rd Abandoned | 1958 | 20,343 | Fair |
| US 36 E over US 169 | 1961 | 20,169 | Fair |
All bridges nearby: Buchanan County, MO bridge conditions · every bridge in Buchanan County · Missouri bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.