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Oil Valley School over Johnson Creek

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

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

Oil Valley School over Johnson Creek in Carroll County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 3 (serious condition) on the 0-9 scale.
It was built in 1986, making it 39 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2021).
Its listed owner is the county highway agency.
It is one of 26 of the 180 inventoried bridges in Carroll County rated poor (14.4%); 26 (14.4%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 46 ft
Location	2 Mi SE Mt Carroll
NBI structure number	008362100000000
Condition class	Poor

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