Ill 150 over Rock Fork CR
Perry County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ill 150 over Rock Fork CR in Perry County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1928, making it 97 years old at the 2025 inventory.
- It carries about 775 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.
- 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 December 2024, on a 12-month routine inspection cycle.
- 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 → (38.06784, -89.55638)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 22 ft |
| Location | 1.3 Mi.s.of Ill 154 |
| NBI structure number | 073200200000000 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | December 2024 |
| Inspection interval (item 91) | 12 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 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 |
| US 51-fap322 over Chstnt-cnic-oak-alley | 1997 | 4,400 | Fair |
| Ill 127 over Opossum Creek | 1936 | 4,150 | Fair |
| Fap 841-il 154 over Little Beaucoup CR | 2001 | 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.