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SD089 over Ck Mickelson Trail

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

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

SD089 over Ck Mickelson Trail in Custer 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 deck, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1970, making it 55 years old at the 2025 inventory.
It carries about 1,218 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 42 of the 94 inventoried bridges in Custer County rated fair (44.7%); 5 (5.3%) 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 206 ft
Location	6.8 N Fall River Co Line
NBI structure number	000000017206211
Condition class	Fair

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