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Ill 155 over Prairie Du Rocher CR

Randolph County, Illinois · rated Poor in the 2025 National Bridge Inventory

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

Ill 155 over Prairie Du Rocher CR in Randolph County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1990, making it 35 years old at the 2025 inventory.
It carries about 100 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 10 of the 149 inventoried bridges in Randolph County rated poor (6.7%); 10 (6.7%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 222 ft
Location	Near Wcl P Du Rocher
NBI structure number	079004000000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
Il 3 over Black Creek	1995	8,400	Good
Ill 150 over Miss Riv/fau 9416	1942	6,250	Poor
Il 3 over UPRR	1971	5,650	Good
Il 3 over Nine Mile Creek	2024	5,650	Good
Ill 4-150 over Marys River	1928	5,500	Fair
Il 150 over Little Marys River	1999	5,450	Good