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SD079 over North Willow Ck

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

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

SD079 over North Willow Ck in Butte 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 5 (fair condition) on the 0-9 scale.
It was built in 1968, making it 57 years old at the 2025 inventory.
It carries about 581 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 76 of the 142 inventoried bridges in Butte County rated fair (53.5%); 20 (14.1%) 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	Continuous steel stringer or multi-beam girder
Length	about 184 ft
Location	4.9 S Jct Sd 168
NBI structure number	000000010310215
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
US085 over Hay Ck	1963	15,432	Fair
US085 over Belle Fourche Rv	1958	10,476	Fair
SD034 over Willow Ck	1939	3,961	Fair
SD034 over Redwater Rv	1992	3,547	Fair
SD034 over Redwater Canal	1964	3,547	Good
SD034 over False Bottom Ck	1992	3,547	Fair