County Line Road over County Ditch
Whiteside County, Illinois · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Line Road over County Ditch in Whiteside County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1971, making it 54 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2017).
- Its listed owner is a town or township highway agency.
- It is one of 54 of the 278 inventoried bridges in Whiteside County rated good (19.4%); 23 (8.3%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (41.67534, -89.63229)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 74 ft |
| Location | 6.5 Mi Sse Rock Fall |
| NBI structure number | 098496200000000 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Whiteside County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Il 40 over Rock River | 2012 | 19,800 | Good |
| I-88 over Ditch | 1975 | 13,100 | Good |
| Fai 88 over Stream | 1975 | 12,600 | Fair |
| I-88 over Ditch | 1975 | 12,500 | Good |
| I-88 over Ditch | 1975 | 12,500 | Good |
| Il 40 Locust St over Stream | 1987 | 11,100 | Good |
All bridges nearby: Whiteside County, IL bridge conditions · every bridge in Whiteside County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.