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Fas 323 Onarga Rd over Spring Creek

Iroquois County, Illinois · rated Good in the 2025 National Bridge Inventory

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

Fas 323 Onarga Rd over Spring Creek in Iroquois County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 1989, making it 36 years old at the 2025 inventory.
It carries about 450 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 258 of the 568 inventoried bridges in Iroquois County rated good (45.4%); 83 (14.6%) 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


Structure	Continuous steel stringer or multi-beam girder
Length	about 130 ft
Location	5.62 Mi W of Ill 49
NBI structure number	038019200000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
I-57 over Dranage Ditch	2015	18,100	Fair
I-57 over Dranage Ditch	2015	18,100	Fair
I-57 NB & SB over Prairie Creek	2015	18,100	Fair
Fai-57 over Stream	1971	17,600	Fair
I-57 SB over Langan Creek	2013	9,550	Fair
Fai-57 NB over Langan Creek	2014	9,550	Fair