US 51-fap322 over Chstnt-cnic-oak-alley
Perry County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 51-fap322 over Chstnt-cnic-oak-alley in Perry County, Illinois, 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 1997, making it 28 years old at the 2025 inventory.
- It carries about 4,400 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 75 of the 136 inventoried bridges in Perry County rated fair (55.1%); 10 (7.4%) are rated poor.
- 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 → (38.00997, -89.24155)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 5 | Fair condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 806 ft |
| Location | Near Downtwn Duquoin |
| NBI structure number | 073003300000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Perry County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 51 over Half-mile Creek | 1921 | 6,350 | Fair |
| Ill 154 over Beaucoup Creek | 1962 | 5,750 | Poor |
| Fap 42-il 13/127 over Chicken Creek | 2001 | 4,700 | Good |
| Ill 127 over Opossum Creek | 1936 | 4,150 | Fair |
| Fap 841-il 154 over Little Beaucoup CR | 2001 | 4,000 | Good |
| Ill 154 over Panther Creek | 2011 | 4,000 | Good |
All bridges nearby: Perry County, IL bridge conditions · every bridge in Perry County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.