Tr-20a over Spring Creek

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

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

• Tr-20a over Spring Creek in LaSalle 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 5 (fair condition) on the 0-9 scale.
• It was built in 1966, making it 59 years old at the 2025 inventory.
• It carries about 25 vehicles a day (traffic count year 2016).
• Its listed owner is a town or township highway agency.
• It is one of 255 of the 528 inventoried bridges in LaSalle County rated fair (48.3%); 75 (14.2%) 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.

View this bridge on a map → (41.42664, -89.14587)

Component ratings

Bridge details

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

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.