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Tr 175 over Slug Run

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

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

Tr 175 over Slug Run in Warren County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1900 and reconstructed in 1974, making it 125 years old at the 2025 inventory.
It carries about 75 vehicles a day (traffic count year 2016).
Its listed owner is a town or township highway agency.
It is one of 15 of the 199 inventoried bridges in Warren County rated poor (7.5%); 15 (7.5%) 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	Steel stringer or multi-beam girder
Length	about 41 ft
Location	Se-26-t10nr1w
NBI structure number	094421100000000
Condition class	Poor

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