Tr 7 over I-55

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

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

Tr 7 over I-55 in Montgomery 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 1970, making it 55 years old at the 2025 inventory.
It carries about 75 vehicles a day (traffic count year 2020).
Its listed owner is the state highway agency.
It is one of 116 of the 261 inventoried bridges in Montgomery County rated fair (44.4%); 10 (3.8%) 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 335 ft
Location	1.59M S Co. Line
NBI structure number	068003500000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-55 over Horse Creek	1972	31,350	Fair
I-55 and FRs over Horse Creek	1950	29,350	Fair
FAI 55 and FRs over Shop Creek Trib	1942	26,800	Fair
I-55 and FRs over Shop Creek	1943	26,800	Fair
I-55 over Three Mile Branch	1973	26,500	Fair
I-55 (NB) over Macoupin Creek	1972	14,400	Fair