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I- 55 NB to I-355 over I- 55

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

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

I- 55 NB to I-355 over I- 55 in DuPage 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 2007, making it 18 years old at the 2025 inventory.
It carries about 28,200 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 195 of the 345 inventoried bridges in DuPage County rated fair (56.5%); 26 (7.5%) 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 410 ft
Location	1 M W of Lemont Rd
NBI structure number	022200600000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-88 over I-355	1989	169,900	Fair
I-88 over I-355 NB to I-88 WB	1989	169,900	Fair
I- 55 over Madison St	1959	150,000	Fair
I-355 NB & SB over US-34	1989	147,200	Fair
I-355 over Bn RR	1989	147,200	Good
I-355 NB & SB over Hitchcock Ave.	1989	147,200	Fair