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Bridge conditions in Johnson County, Illinois

118 inventoried bridges · 3 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

3 of the 118 bridges the federal inventory lists in Johnson County are rated poor; the rest split 65 good and 50 fair.

3 of the 118 bridges in Johnson County, Illinois, are rated in poor condition (2.5%) in the 2025 National Bridge Inventory, as of August 20, 2026.
65 bridges (55.1%) are rated good and 50 (42.4%) fair.
The median Johnson County bridge was built in 1981.
The busiest poor-rated bridge is Tr 111 over Dutchman CR. Trib. (built 1978), carrying about 225 vehicles a day.

Good 55.1% · Fair 42.4% · Poor 2.5% of 118 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
Tr 111 over Dutchman CR. Trib.	1978	225	Poor
Sbi 146 over Dutchman Creek	1930	200	Poor
Fr 870 over Wagon Creek	1967	29	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I 24 over Dry Fork Creek	1976	20,700	Fair
I 24 over Mccorkle Creek	1971	20,500	Good
I 24 EB over Tr 42 & L Saline R	1972	10,350	Fair
I 24 WB over Tr 42 & L Saline R	1972	10,350	Fair
I 24 EB over Tr 77 Bowman Bottoms	1971	10,300	Fair
I 24 WB over Tr 77 Bowman Bottoms	1971	10,300	Fair
I 24 WB over US 45	1971	10,300	Fair
I 24 WB over Ill 146	1971	10,250	Fair
I 24 EB over Tr 173 Bethlehem Ch	1971	10,250	Good
I 24 WB over Tr 173 Bethlehem Ch	1971	10,250	Good

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.