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397TH Ave. over Sand Ck

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

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

397TH Ave. over Sand Ck in Sanborn 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 1920, making it 105 years old at the 2025 inventory.
It carries about 35 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 7 of the 54 inventoried bridges in Sanborn County rated poor (13.0%); 7 (13.0%) 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.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 60 ft
Location	7.5N Woonsocket
NBI structure number	000000056030025
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
SD034 over Drainage Ditch	1936	1,738	Fair
SD034 W over James Rv	2003	1,484	Fair
SD034 E over James Rv	2004	1,484	Fair
SD037 S over Sand Ck	1977	1,354	Good
SD037 N over Sand Ck	1976	1,354	Good
SD037 S over James Rv	2002	1,271	Good