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Garden Prairie Roa over I-90

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

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

Garden Prairie Roa over I-90 in Boone County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2015, making it 10 years old at the 2025 inventory.
It carries about 150 vehicles a day (traffic count year 2023).
It is one of 53 of the 109 inventoried bridges in Boone County rated fair (48.6%); 11 (10.1%) 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 prestressed concrete stringer or multi-beam girder
Length	about 231 ft
Location	1 Mi W. of Co. Line
NBI structure number	004999300000000
Condition class	Fair

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