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27100 418 Ave. over Twelve Mile Ck

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

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

27100 418 Ave. over Twelve Mile Ck in Hutchinson 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 1992, making it 33 years old at the 2025 inventory.
It carries about 27 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 86 of the 160 inventoried bridges in Hutchinson County rated fair (53.8%); 24 (15.0%) 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	1.9W 2.2N Milltown
NBI structure number	000000034140030
Condition class	Fair

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

Bridge	Built	Vehicles/day	Condition
SD037 over Pony Ck	1992	3,971	Good
SD037 over Ck	2000	3,375	Good
SD037 over South Fork Twelve Mile C	2000	3,234	Good
US081 over Ck	1994	2,385	Good
SD037 over North Br Dry Ck	2000	2,259	Good
SD037 over Drainage Ditch	2000	2,259	Good