Henning Rd over Big Rock CR
Kendall County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Henning Rd over Big Rock CR in Kendall 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 1987, making it 38 years old at the 2025 inventory.
- It carries about 25 vehicles a day (traffic count year 2024).
- Its listed owner is a town or township highway agency.
- It is one of 49 of the 131 inventoried bridges in Kendall County rated fair (37.4%); 15 (11.5%) 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 → (41.69487, -88.51457)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 5 | Fair condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 149 ft |
| Location | .5 M E Rock CR Rd |
| NBI structure number | 047312600000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Kendall County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ill 47 over Fox River | 1984 | 24,800 | Fair |
| US 34/FAP 311 over Waubansee Creek | 2002 | 24,700 | Fair |
| US 34 over Blackberry Creek | 2019 | 22,400 | Good |
| US 34 over Waubansee Creek | 2001 | 22,300 | Fair |
| US 34 over Rob Roy Creek | 2019 | 18,700 | Good |
| Orchard Rd over Gates Cr/trib to Fox | 2000 | 18,700 | Fair |
All bridges nearby: Kendall County, IL bridge conditions · every bridge in Kendall County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.