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Harrison Ave over Rock River

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

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

Harrison Ave over Rock River in Winnebago County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1975, making it 50 years old at the 2025 inventory.
It carries about 10,200 vehicles a day (traffic count year 2022).
Its listed owner is a city or municipal highway agency.
It is one of 291 of the 465 inventoried bridges in Winnebago County rated fair (62.6%); 32 (6.9%) 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	Steel stringer or multi-beam girder
Length	about 797 ft
Location	0.2 Mi E of Ill Rt 2
NBI structure number	101613000000000
Condition class	Fair

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