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US012 over Whetstone Rv

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

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

US012 over Whetstone Rv in Grant 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 7 (good condition) on the 0-9 scale.
It was built in 2003, making it 22 years old at the 2025 inventory.
It carries about 3,334 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 100 of the 205 inventoried bridges in Grant County rated good (48.8%); 38 (18.5%) 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	Continuous prestressed concrete stringer or multi-beam girder
Length	about 152 ft
Location	0.6 SW Jct Sd 109
NBI structure number	000000026369027
Condition class	Good

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

Bridge	Built	Vehicles/day	Condition
Irr I029 over Indian Rv	1976	6,600	Fair
US012 over Whetstone Rv Div Channel	1955	3,765	Fair
Irr I029 S over 146 St	1977	3,650	Fair
Irr I029 N over 146 St	1977	3,650	Good
Irr I029 S over 149 St (fas 6266)	1976	3,650	Fair
Irr I029 N over 149 St (fas 6266)	1976	3,650	Fair