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Roscoe Rd over Rock River

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

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

Roscoe Rd over Rock River in Winnebago County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 2 (critical condition) on the 0-9 scale.
It was built in 1967, making it 58 years old at the 2025 inventory.
It carries about 10,700 vehicles a day (traffic count year 2023).
Its listed owner is the county highway agency.
It is one of 32 of the 465 inventoried bridges in Winnebago County rated poor (6.9%); 32 (6.9%) 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 581 ft
Location	0.2 Mi. W. Il 251
NBI structure number	101301600000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-39 & US 20 over Madigan Creek	1963	50,900	Fair
I-90 N B over US 20 Br	2009	36,350	Good
I-90 S B over US 20 Br	2009	36,350	Good
US 20 W B over Ill 251 (11TH St)	1960	36,000	Fair
I-90 over Stream	1958	34,100	Good
US 20 E B over Kishwaukee St.	1960	32,000	Fair