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Il 1 over Rock Creek

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

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

Il 1 over Rock Creek in Hardin 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 2015, making it 10 years old at the 2025 inventory.
It carries about 1,100 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 35 of the 61 inventoried bridges in Hardin County rated good (57.4%); 4 (6.6%) 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 131 ft
Location	3.3 Mi S Gallatin Co
NBI structure number	035001700000000
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Ill 146 over Big Creek	2004	1,900	Good
Ill 34 & Ill 146 over Threemile Creek	2009	1,550	Fair
Ill 146 over Hosick Creek	1953	1,500	Poor
Ill 146 over Peters Creek	2013	1,500	Good
Ill 146 over Stream	1954	1,500	Good
Ill 34 over Rose Creek	1924	1,400	Fair