Big Timber Rd over Tyler CR.
Kane County, Illinois · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Big Timber Rd over Tyler CR. in Kane County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 2003, making it 22 years old at the 2025 inventory.
- It carries about 14,500 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 162 of the 339 inventoried bridges in Kane County rated fair (47.8%); 24 (7.1%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (deck 7 to 6, substructure 8 to 7).
- Its most recent inspection on record is dated July 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 → (42.07252, -88.35729)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 8 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 77 ft |
| Location | 1.25M W. Randall Rd |
| NBI structure number | 045315700000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 24 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 Kane County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-88 WB over Fox R - RR - Il 25 | 1958 | 86,200 | Fair |
| I-88 EB over Fox R - RR - Il 25 | 2008 | 86,200 | Fair |
| I-90 over S Br Kishwaukee Riv | 2014 | 76,200 | Good |
| I-90 over Stream | 1958 | 58,700 | Good |
| I-90 over Sleepy Hollow Rd | 2014 | 52,600 | Good |
| I-90 over Sleepy Hollow Rd | 2014 | 52,600 | Good |
All bridges nearby: Kane County, IL bridge conditions · every bridge in Kane County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.