SD1806EF over Diversion Channel

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

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

• SD1806EF over Diversion Channel in Stanley 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 culvert, rated 8 (very good condition) on the 0-9 scale.
• It was built in 1998, making it 27 years old at the 2025 inventory.
• It carries about 50 vehicles a day (traffic count year 2023).
• Its listed owner is the state highway agency.
• It is one of 13 of the 37 inventoried bridges in Stanley County rated good (35.1%); 6 (16.2%) are rated poor.
• Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
• Its condition class and component ratings are unchanged from the 2024 inventory.
• Its most recent inspection on record is dated November 2023, on a 48-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 → (44.40407, -100.39483)

Component ratings

Bridge details

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

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