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270 St over Twelve Mile Ck

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

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

270 St over Twelve Mile Ck in Hutchinson County, South Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
It was built in 2020, making it 5 years old at the 2025 inventory.
It carries about 257 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 50 of the 160 inventoried bridges in Hutchinson County rated good (31.2%); 24 (15.0%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 89 ft
Location	7E of Dimock
NBI structure number	000000034134020
Condition class	Good

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