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469TH Avenue over Six Mile Ck

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

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

469TH Avenue over Six Mile Ck in Brookings 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 1930, making it 95 years old at the 2025 inventory.
It carries about 92 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 115 of the 232 inventoried bridges in Brookings County rated fair (49.6%); 53 (22.8%) 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 69 ft
Location	2W & 0.5S Brookings
NBI structure number	000000006150165
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
I029 over Ck	1966	12,240	Fair
I029 over Ck	1966	12,240	Fair
I029 over Ck	1970	9,960	Fair
I029 over Ck	1970	9,960	Fair
I029 over Br Six Mile Ck	1970	9,960	Fair
US014 B over West Br Six Mile Ck	1967	9,030	Fair