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Ill 15 over Little Mud Creek

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

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

Ill 15 over Little Mud Creek in St. Clair County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
It was built in 1936, making it 89 years old at the 2025 inventory.
It carries about 1,850 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 235 of the 485 inventoried bridges in St. Clair County rated good (48.5%); 45 (9.3%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings

Component	Rating (2025)	FHWA scale meaning
Culvert	7	Good condition


Structure	Continuous concrete culvert
Length	about 28 ft
Location	E Cl St Libory
NBI structure number	082200900000000
Condition class	Good

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