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Fai 55 SB over Mazon River @ Tr 125

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

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

Fai 55 SB over Mazon River @ Tr 125 in Grundy 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 6 (satisfactory condition) on the 0-9 scale.
It was built in 1955 and reconstructed in 1993, making it 70 years old at the 2025 inventory.
It carries about 12,050 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 95 of the 268 inventoried bridges in Grundy County rated fair (35.4%); 76 (28.4%) 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 steel stringer or multi-beam girder
Length	about 233 ft
Location	4.1 Mi S of Reed Rd
NBI structure number	032000600000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Fai 80 (EB & WB) over Fas285/ch5/ridge Rd	2003	50,300	Fair
Fai 080 (EB & WB) over Walley Run CR	2003	39,100	Good
Fai 80 (EB & WB) over Aux Sable Crk	2003	39,100	Fair
Fai 80 (EB & WB) over Collins Run Creek	2003	39,100	Good
Fai-55 & Or 66 over Woods Run	1979	24,300	Good
I-55 over Brewster Run	1979	22,900	Good