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TR-186 Risdon Sch over Doza Creek

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

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

TR-186 Risdon Sch over Doza Creek 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 deck, rated 5 (fair condition) on the 0-9 scale.
It was built in 1998, making it 27 years old at the 2025 inventory.
It carries about 75 vehicles a day (traffic count year 2023).
Its listed owner is a town or township 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	Prestressed concrete multiple box beam
Length	about 109 ft
Location	1.5MI West of Ch 27
NBI structure number	082413700000000
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