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Tr-120 over Flat Creek

Marion County, Illinois · rated Fair in the 2025 National Bridge Inventory

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

Tr-120 over Flat Creek in Marion County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1909, making it 116 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2022).
Its listed owner is a town or township highway agency.
It is one of 90 of the 294 inventoried bridges in Marion County rated fair (30.6%); 22 (7.5%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 38 ft
Location	1.5 Mi NE Vernon
NBI structure number	061308400000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
Fai-57 over Raccoon Creek	1966	21,000	Good
Fai-57 over Br E Fork Kaskaskia	1970	18,100	Good
Fai-57 over S Trib E Br Kask Rvr	1969	18,100	Good
Fai-57 over N Trib E Br Kask Rvr	1969	18,100	Good
US 50 over Vermillion Creek	1994	10,300	Good
Fai-57 NB over Crooked Creek	1968	9,650	Poor