County Line Rd over Mud Creek
Boone County, Illinois · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Line Rd over Mud Creek in Boone County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 675 vehicles a day (traffic count year 2021).
- Its listed owner is a town or township highway agency.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.2939, -88.70563)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 4 | Poor condition |
Bridge details
| Structure | Steel culvert |
| Length | about 24 ft |
| Location | 8.0 Mi NE Belvidere |
| NBI structure number | 004301800000000 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
All bridges nearby: Boone County, IL bridge conditions · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.