435 Ave (fas 6211) over I090

McCook County, South Dakota · rated Good in the 2025 National Bridge Inventory

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

• 435 Ave (fas 6211) over I090 in McCook County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
• It was built in 1964, making it 61 years old at the 2025 inventory.
• It carries about 148 vehicles a day (traffic count year 2023).
• Its listed owner is the state highway agency.
• It is one of 44 of the 98 inventoried bridges in McCook County rated good (44.9%); 7 (7.1%) are rated poor.
• Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
• It was rated fair in the 2024 inventory and is now good (deck 5 to 8, superstructure 5 to 7, substructure 6 to 7).
• Its most recent inspection on record is dated September 2024, 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 → (43.66461, -97.50847)

Component ratings

Bridge details

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

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