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I029 N over 471 Ave

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

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

I029 N over 471 Ave in Deuel 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 1973, making it 52 years old at the 2025 inventory.
It carries about 4,870 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 43 of the 72 inventoried bridges in Deuel County rated fair (59.7%); 13 (18.1%) 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 157 ft
Location	3.5 NW Sd 28 Interch
NBI structure number	000000020050248
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 Deer Ck	1971	7,560	Fair
I029 S over 471 Ave	1973	4,870	Fair
I029 S over Peg Munky Run Ck	1973	4,870	Fair
I029 N over Peg Munky Run Ck	1973	4,870	Fair
I029 S over 184 St	1973	4,830	Fair
I029 N over 184 St	1973	4,830	Fair