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County Line Rd over Spring Creek

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

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

County Line Rd over Spring Creek in Boone County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2016, making it 9 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2018).
Its listed owner is a town or township highway agency.
It is one of 45 of the 109 inventoried bridges in Boone County rated good (41.3%); 11 (10.1%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 73 ft
Location	2 Mi SE Garden Prair
NBI structure number	004309400000000
Condition class	Good

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