31880 472 Ave over Big Ditch Ck

Union County, South Dakota · rated Fair in the 2025 National Bridge Inventory

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

• 31880 472 Ave over Big Ditch Ck in Union County, South Dakota, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
• It was built in 2006, making it 19 years old at the 2025 inventory.
• It carries about 105 vehicles a day (traffic count year 2022).
• Its listed owner is the county highway agency.
• It is one of 77 of the 169 inventoried bridges in Union County rated fair (45.6%); 41 (24.3%) are rated poor.
• Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
• It was rated good in the 2024 inventory and is now fair (culvert 7 to 6).
• Its most recent inspection on record is dated August 2024, on a 48-month routine inspection cycle.
• A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

View this bridge on a map → (42.76954, -96.76634)

Component ratings

Bridge details

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

Busiest bridges in Union County

All bridges nearby: Union County, SD bridge conditions · every bridge in Union County · South Dakota bridges.

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