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Old Hwy 85 over Four Mile Ck

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

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

Old Hwy 85 over Four Mile Ck in Butte 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 superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1945, making it 80 years old at the 2025 inventory.
It carries about 25 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 20 of the 142 inventoried bridges in Butte County rated poor (14.1%); 20 (14.1%) 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	Timber stringer or multi-beam girder
Length	about 103 ft
Location	4.2E 32.8N B Fourche
NBI structure number	000000010142047
Condition class	Poor

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