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Il 121 over Salt Creek

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

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

Il 121 over Salt Creek in Logan County, Illinois, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1928 and reconstructed in 1990, making it 97 years old at the 2025 inventory.
It carries about 3,500 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 183 of the 292 inventoried bridges in Logan County rated fair (62.7%); 27 (9.2%) 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	Continuous steel stringer or multi-beam girder
Length	about 573 ft
Location	3.9M N Il54-mt Pul.*
NBI structure number	054002100000000
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I-55 over Hurlbut Creek	1974	34,900	Fair
I 55 & E&w Fr Rds over Wolf Creek	1944	33,125	Fair
I-55 over Drainage Ditch	1974	32,400	Fair
I-55 over Clear Creek	1976	21,600	Fair
I-55 over Drainage Ditch	1974	21,500	Fair
I-55 over Trib Lake Fork	1922	17,450	Fair