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Old Sawmill Road over Mickelson Trail

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

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

Old Sawmill Road over Mickelson Trail in Custer 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 2009, making it 16 years old at the 2025 inventory.
It carries about 50 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 47 of the 94 inventoried bridges in Custer County rated good (50.0%); 5 (5.3%) 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	Prestressed concrete channel beam
Length	about 67 ft
Location	1.0 South of Custer
NBI structure number	000000017226094
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
US016 over French Ck	1966	10,052	Fair
US016 over Ck	1966	10,052	Good
US016A over Laughing Water Ck	1964	6,829	Good
SD079 over Battle Ck	1997	6,610	Good
US016 over French Ck	1974	3,709	Fair
US016 over French Ck	1974	3,709	Fair