Irr SD010 over Clear Lake Inlet

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

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

• Irr SD010 over Clear Lake Inlet in Marshall 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 7 (good condition) on the 0-9 scale.
• It was built in 1993, making it 32 years old at the 2025 inventory.
• It carries about 692 vehicles a day (traffic count year 2024).
• Its listed owner is the state highway agency.
• It is one of 7 of the 38 inventoried bridges in Marshall County rated good (18.4%); 13 (34.2%) 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 June 2024, 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 → (45.69526, -97.34112)

Component ratings

Bridge details

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

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