25020 415 Avenue over Rock Ck

Hanson County, South Dakota · rated Poor in the 2025 National Bridge Inventory

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

• 25020 415 Avenue over Rock Ck in Hanson County, South Dakota, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
• It was built in 1967, making it 58 years old at the 2025 inventory.
• It carries about 60 vehicles a day (traffic count year 2022).
• Its listed owner is the county highway agency.
• It is one of 8 of the 62 inventoried bridges in Hanson County rated poor (12.9%); 8 (12.9%) are rated poor.
• A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

View this bridge on a map → (43.75859, -97.90938)

Component ratings

Bridge details

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

Busiest bridges in Hanson County

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

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