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US083 over Swan Ck

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

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

US083 over Swan Ck in Walworth 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 substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2005, making it 20 years old at the 2025 inventory.
It carries about 767 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 21 of the 33 inventoried bridges in Walworth County rated fair (63.6%); 1 (3.0%) are rated poor.
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.

Component ratings


Structure	Prestressed concrete stringer or multi-beam girder
Length	about 108 ft
Location	4.3 N Potter Co Line
NBI structure number	000000065200197
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US012 over Burlington Northern RR	1969	2,111	Good
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