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Tr 399-100n over I-74

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

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

Tr 399-100n over I-74 in Knox 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 5 (fair condition) on the 0-9 scale.
It was built in 1965, making it 60 years old at the 2025 inventory.
It carries about 75 vehicles a day (traffic count year 2010).
Its listed owner is the state highway agency.
It is one of 123 of the 304 inventoried bridges in Knox County rated fair (40.5%); 32 (10.5%) 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	Continuous steel stringer or multi-beam girder
Length	about 223 ft
Location	1 Mi SW of Woodhull
NBI structure number	037010500000000
Condition class	Fair

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