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486 Avenue over Lost Ck

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

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

486 Avenue over Lost Ck 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 substructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1973, making it 52 years old at the 2025 inventory.
It carries about 73 vehicles a day (traffic count year 2022).
Its listed owner is the county 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	Prestressed concrete tee beam
Length	about 50 ft
Location	1W 10.8N Gary
NBI structure number	000000020200022
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 N 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