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Tr 345 over Six Mile Tributary

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

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

Tr 345 over Six Mile Tributary in Pike 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 1977, making it 48 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2023).
Its listed owner is a town or township highway agency.
It is one of 34 of the 332 inventoried bridges in Pike County rated poor (10.2%); 34 (10.2%) 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 23 ft
Location	1.59 mi E US 54
NBI structure number	075333300000000
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-72 / US 36 over Miss R/bnrr/nsrr/st	1999	16,500	Poor
I-72 over Trib Blue Creek	1988	9,900	Good
I-72 over Drainage Ditch	1988	9,410	Good
I-72 over Drainage Ditch	1986	9,400	Fair
I-72 over Drainage Ditch	1986	9,400	Fair
I-72 / US 36 over Drainage Ditch	1986	9,400	Fair