Berm Access Road over Lake Argyle Splwy

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

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

• Berm Access Road over Lake Argyle Splwy in McDonough County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
• It was built in 1958, making it 67 years old at the 2025 inventory.
• It carries about 50 vehicles a day (traffic count year 2021).
• It is one of 112 of the 210 inventoried bridges in McDonough County rated good (53.3%); 13 (6.2%) are rated poor.
• 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 → (40.44921, -90.78695)

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.