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Il 15 over Nsrr Icrr

St. Clair County, Illinois · rated Fair in the 2025 National Bridge Inventory

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

Il 15 over Nsrr Icrr in St. Clair 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 1940 and reconstructed in 1985, making it 85 years old at the 2025 inventory.
It carries about 28,700 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 205 of the 485 inventoried bridges in St. Clair County rated fair (42.3%); 45 (9.3%) 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 319 ft
Location	.70MI E Jct Il 157
NBI structure number	082004100000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Psb I-55 64;US 40 over Mississippi River	1963	113,200	Fair
I-55/64; US 40 Psc over Trra	1966	113,200	Poor
I-55/64; US 40 EB over 4TH ST in E ST LOU	1965	105,300	Fair
EB 55/MLK Eb&wb Ap over 3RD ST EXIT to EStL	1961	105,300	Good
I-55/70;/64 over Csxrr Nsrr Trrarr	1959	66,500	Poor
I-55/64EB mainlne" over UPRR IL 3 ramp UPRR UPRR	1995	56,600	Fair