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S. Appleton Road over Kishwaukee River

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

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

S. Appleton Road over Kishwaukee River in Boone 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 4 (poor condition) on the 0-9 scale.
It was built in 1964, making it 61 years old at the 2025 inventory.
It carries about 11,700 vehicles a day (traffic count year 2018).
Its listed owner is a city or municipal highway agency.
It is one of 11 of the 109 inventoried bridges in Boone County rated poor (10.1%); 11 (10.1%) 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 119 ft
Location	N of Locust St
NBI structure number	004700300000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I 90 over Stream	2014	51,100	Fair
I-90 over Stream	1958	28,000	Good
I 90 WB over Mosquito Crk	2013	28,000	Fair
I 90 EB over Mosquito Ckr	2013	28,000	Good
I-90 over Stream	1958	25,700	Fair
I-90 over Stream	1958	25,550	Good