Bridge conditions in Stephenson County, Illinois
340 inventoried bridges · 11 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 340 bridges in Stephenson County: 203 rated good, 126 fair, and 11 poor.
- 11 of the 340 bridges in Stephenson County, Illinois, are rated in poor condition (3.2%) in the 2025 National Bridge Inventory, as of .
- 203 bridges (59.7%) are rated good and 126 (37.1%) fair.
- The median Stephenson County bridge was built in 1982.
- The busiest poor-rated bridge is Hancock Avenue over Pecatonica River (built 1952), carrying about 1,300 vehicles a day.
Good 59.7% · Fair 37.1% · Poor 3.2% of 340 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.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Hancock Avenue over Pecatonica River | 1952 | 1,300 | Poor |
| N. Park Road over Yellow Creek | 1919 | 950 | Poor |
| Old Il 26 over Richland Ck&c Wis RR | 1929 | 475 | Poor |
| Old Il 26 over E Br Richland Creek | 1927 | 475 | Poor |
| North Dakota Rd over Branch Cedar Creek | 1943 | 375 | Poor |
| Farwell Bridge Roa over Pecatonica River | 1971 | 300 | Poor |
| N Afolkey Road over Brush Creek | 1914 | 200 | Poor |
| Loran Rd. over Plum CR. Br. | 1934 | 200 | Poor |
| S Mill Grove Road over Yellow Creek | 1931 | 100 | Poor |
| W. Koeller Road over East Plum River | 1992 | 50 | Poor |
| N. Coon Road over Brush Creek | 1947 | 25 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 EB over Sumner Creek | 1959 | 12,700 | Fair |
| US 20 WB over Wickham Creek | 1983 | 12,700 | Fair |
| US 20WB over Sumner Creek | 1994 | 12,700 | Good |
| US 20 EB over Wickham Creek | 1999 | 12,700 | Fair |
| US 20 & Private Rd over Silver Creek Trib | 1959 | 12,700 | Fair |
| Il 26 over Yellow Creek | 1988 | 12,600 | Fair |
| Ill 26 (fap 316) over Pecatonica River | 1983 | 12,500 | Fair |
| Ill 26 over Cn RR | 1986 | 12,500 | Fair |
| Il 26 over Drainage Ditch | 1995 | 9,100 | Good |
| US 20 over Cn Railroad | 2010 | 8,050 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
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.