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Squaw Prairie Rd over Piscasaw Creek

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

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

Squaw Prairie Rd over Piscasaw Creek 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 deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1978, making it 47 years old at the 2025 inventory.
It carries about 1,350 vehicles a day (traffic count year 2023).
Its listed owner is a town or township highway agency.
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	Prestressed concrete multiple box beam
Length	about 145 ft
Location	2.0 Mi NE Belvidere
NBI structure number	004307100000000
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