South First Street over S BR Kishwaukee Riv

DeKalb County, Illinois · rated Good in the 2025 National Bridge Inventory

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

• South First Street over S BR Kishwaukee Riv in DeKalb County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
• It was built in 2021, making it 4 years old at the 2025 inventory.
• It carries about 450 vehicles a day (traffic count year 2021).
• Its listed owner is the county highway agency.
• It is one of 103 of the 262 inventoried bridges in DeKalb County rated good (39.3%); 33 (12.6%) are rated poor.
• Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
• Its class is unchanged from 2024 (good), but component ratings moved: culvert 9 to 8.
• Its most recent inspection on record is dated June 2023, on a 24-month routine inspection cycle.
• A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

View this bridge on a map → (41.89271, -88.77485)

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.