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485TH Avenue over East Br Deer Ck

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

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

485TH Avenue over East Br Deer 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 substructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 2007, making it 18 years old at the 2025 inventory.
It carries about 63 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	Prestressed concrete tee beam
Length	about 64 ft
Location	5.2N & 7.8E Bushnell
NBI structure number	000000006318098
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