Chicago Rd over I-39 & US 51
Lee County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Chicago Rd over I-39 & US 51 in Lee 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 1983, making it 42 years old at the 2025 inventory.
- It carries about 950 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 184 of the 373 inventoried bridges in Lee County rated fair (49.3%); 42 (11.3%) 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 → (41.69856, -89.03134)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 5 | Fair condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 306 ft |
| Location | 4.8 Mi S of US 30 |
| NBI structure number | 052005500000000 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Lee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 52 & Il 2 & Il over Rock River | 2002 | 22,100 | Fair |
| I 39&US 51 over Steward Creek Branch | 1984 | 19,500 | Fair |
| I 39&US 51 over Dry Run Creek | 1982 | 19,100 | Fair |
| I 39&US 51 over Stream | 1984 | 19,100 | Fair |
| I 39&US 51 over Harmon Creek South | 1982 | 19,100 | Fair |
| I 39&US 51 over Willow Creek | 1983 | 18,700 | Fair |
All bridges nearby: Lee County, IL bridge conditions · every bridge in Lee County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.