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30620 455 Ave over Ck

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

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

30620 455 Ave over Ck in Clay 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 1974, making it 51 years old at the 2025 inventory.
It carries about 97 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 41 of the 93 inventoried bridges in Clay County rated fair (44.1%); 14 (15.1%) 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	Timber stringer or multi-beam girder
Length	about 44 ft
Location	9.2S & 3E Irene Sd
NBI structure number	000000014030092
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
SD050 over Sd 50 Wl So Dak Owned R	1981	5,147	Good
SD050 over Vermillion Rv	1981	5,147	Fair
SD046 over Blind Ck	2020	3,303	Good
SD050 E over SD050 L	1977	3,094	Fair
SD019 over Vermillion Rv	1997	2,764	Good
SD019 over BNSF RR	1997	2,764	Good