Bridge conditions in Whiteside County, Illinois
278 inventoried bridges · 23 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
23 of the 278 bridges the federal inventory lists in Whiteside County are rated poor; the rest split 54 good and 201 fair.
- 23 of the 278 bridges in Whiteside County, Illinois, are rated in poor condition (8.3%) in the 2025 National Bridge Inventory, as of .
- 54 bridges (19.4%) are rated good and 201 (72.3%) fair.
- The median Whiteside County bridge was built in 1975.
- The busiest poor-rated bridge is Second Street over Hennepin Canal Feedr (built 1976), carrying about 1,450 vehicles a day.
Good 19.4% · Fair 72.3% · Poor 8.3% of 278 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
Busiest bridges in the 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 |
| Ill 136 over Mississippi Rv & RR | 1974 | 10,500 | Fair |
| US 30 over Sunfish Slough | 1999 | 9,650 | Fair |
| US 30 over Lincoln St/dakin Rd | 1955 | 9,650 | Fair |
| US 30 over Union Pacific RR | 1956 | 9,650 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
Every bridge in Whiteside County → - all 278, busiest first, each with its own condition record.
All of Illinois: Illinois bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.