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Ill 138 over Fai 55

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

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

Ill 138 over Fai 55 in Macoupin County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1973, making it 52 years old at the 2025 inventory.
It carries about 3,350 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 111 of the 240 inventoried bridges in Macoupin County rated fair (46.2%); 40 (16.7%) 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	Steel stringer or multi-beam girder
Length	about 274 ft
Location	I-55/IL 138 Int
NBI structure number	059003900000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Fai 55 SB over Tr 439	1973	15,200	Fair
Fai 55 NB over Tr 439	1973	15,200	Fair
Ill 108 over Drainage Ditch	1933	6,950	Fair
Ill 4 over East Fork Creek	1957	4,800	Fair
Il 111 over Little Piasa Creek	1929	4,550	Fair
Il 111 over S Br Little Piasa CR	1929	4,550	Fair