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Rio Road over I-74

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

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

Rio Road over I-74 in Knox County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 3 (serious condition) on the 0-9 scale.
It was built in 1966, making it 59 years old at the 2025 inventory.
It carries about 200 vehicles a day (traffic count year 2022).
Its listed owner is the state highway agency.
It is one of 32 of the 304 inventoried bridges in Knox County rated poor (10.5%); 32 (10.5%) 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	Continuous steel stringer or multi-beam girder
Length	about 222 ft
Location	5 Mi S Woodhull
NBI structure number	048003700000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Fai 74 over Spoon Riv Tributary	1968	15,400	Fair
I-74 over Stream	1967	15,000	Fair
US 34 EB over US 150	1965	12,900	Fair
US 150 (main St) over Cedar Creek BNSF RR	2012	10,300	Fair
EB I-74 over Main (fau 6800)	1963	9,500	Fair
WB I-74 over E. Main St	1963	9,500	Fair