Back Bone Rd(fas 5 over Vermilion River
Vermilion County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Back Bone Rd(fas 5 over Vermilion River in Vermilion County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1975, making it 50 years old at the 2025 inventory.
- It carries about 775 vehicles a day (traffic count year 2023).
- Its listed owner is a town or township highway agency.
- It is one of 319 of the 494 inventoried bridges in Vermilion County rated fair (64.6%); 31 (6.3%) 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 January 2024, on a 24-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 → (40.08485, -87.59386)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 389 ft |
| Location | 2.0 Mi SE Danville |
| NBI structure number | 092328400000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Vermilion County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-74 over Feather Creek | 1959 | 25,200 | Fair |
| Il 1 US 150 (fap 3 over 14TH St(fau 7010) | 1966 | 24,700 | Fair |
| Il 1 US 150 (fap 3 over Vermilion River | 1957 | 23,100 | Fair |
| IL.1/US 150(FAP 33 over I-74 & CD16.23/16.33 | 1965 | 19,500 | Fair |
| Il 1 US 150 (fap 3 over Norfolk Southern Railway | 2003 | 19,500 | Good |
| FAP332(IL 1 US 150 over Grape Creek | 1991 | 18,900 | Fair |
All bridges nearby: Vermilion County, IL bridge conditions · every bridge in Vermilion County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.