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US012 over Burlington Northern RR

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

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

US012 over Burlington Northern RR in Walworth 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 deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1969, making it 56 years old at the 2025 inventory.
It carries about 2,111 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 11 of the 33 inventoried bridges in Walworth County rated good (33.3%); 1 (3.0%) are rated poor.
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.

Component ratings


Structure	Continuous prestressed concrete stringer or multi-beam girder
Length	about 157 ft
Location	0.2 S Jct Sd 130 E
NBI structure number	000000065210063
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US012 over Ck	1969	2,111	Good
Irr US012 over Missouri Rv (oahe Lk)	1959	2,071	Fair
Irr Ar US012 over Burlington Northern RR	1957	2,071	Fair
US012 over Blue Blanket Ck	1964	1,963	Fair
US012 over Ck	1965	1,544	Fair
US012 Wf over Ck	1965	1,374	Fair