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Ill 78 over Johnson Creek

Carroll County, Illinois · rated Fair in the 2025 National Bridge Inventory

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

Ill 78 over Johnson Creek in Carroll County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1984, making it 41 years old at the 2025 inventory.
It carries about 1,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 96 of the 180 inventoried bridges in Carroll County rated fair (53.3%); 26 (14.4%) are rated poor.
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.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 74 ft
Location	0.5 Mi S Jct Ill 40
NBI structure number	008003100000000
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.

Bridge	Built	Vehicles/day	Condition
Il 84 over BNSF RR	1988	5,550	Fair
Il 84 over Soo Line Rr/city St	1988	5,550	Fair
Ill 84 over Plum River	1978	4,200	Fair
US 52 & Il 64 over Straddle Creek	1996	3,500	Good
US 52 & Il 64 over Plum River	1999	3,450	Fair
Ill 73 over Straddle Creek	1989	3,350	Fair