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206TH Avenue over Whitewater Ck

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

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

206TH Avenue over Whitewater Ck in Jackson 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 superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1985, making it 40 years old at the 2025 inventory.
It carries about 15 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 50 of the 89 inventoried bridges in Jackson County rated fair (56.2%); 13 (14.6%) 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	Steel stringer or multi-beam girder
Length	about 66 ft
Location	4.6S & 4W Cottonwood
NBI structure number	000000036080066
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I090 over Br Big Buffalo Ck	1968	6,560	Fair
I090 W over Whitewater Ck	1986	3,956	Fair
I090 E over Whitewater Ck	1973	3,956	Fair
I090 W over SD073 Ck	1967	3,552	Fair
I090 E over SD073 Ck	1967	3,552	Good
I090 W over County Rd	1967	3,552	Fair