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412TH Avenue over Creek

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

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

412TH Avenue over Creek in Day 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 1985, making it 40 years old at the 2025 inventory.
It carries about 69 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 10 of the 34 inventoried bridges in Day County rated fair (29.4%); 9 (26.5%) 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 29 ft
Location	4 W & 3.7 N of Andover
NBI structure number	000000019000083
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
446A Avenue over Blue Dog Lake	2023	852	Good
SD027 over Antelope Ck	1970	428	Fair
SD027 over Ck	1970	428	Fair
130TH Street over Creek	1935	385	Fair
130TH Street over Creek	1930	376	Good
128TH Street over Creek	2011	307	Good