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Tr 206 over Slug Run

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

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

Tr 206 over Slug Run in Warren County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
It was built in 1977, making it 48 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2016).
Its listed owner is a town or township highway agency.
It is one of 135 of the 199 inventoried bridges in Warren County rated good (67.8%); 15 (7.5%) 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

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

Bridge	Built	Vehicles/day	Condition
US 34 Il 164 Il 1 over Cedar CR Trib	1964	9,450	Poor
US 34 over Cedar Creek Trib	1985	8,950	Poor
US 34 over Tr 206 (150TH St)	1985	8,950	Fair
US 34 over Trib to Cedar CR	1986	8,950	Fair
US 34 over Trib to Cedar CR	1986	8,950	Fair
US 34 over Cedar Creek	2023	8,950	Good