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US012 over Whetstone Rv Div Channel

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

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

US012 over Whetstone Rv Div Channel in Grant 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 superstructure, rated 5 (fair condition) on the 0-9 scale.
It was built in 1955 and reconstructed in 1977, making it 70 years old at the 2025 inventory.
It carries about 3,765 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 67 of the 205 inventoried bridges in Grant County rated fair (32.7%); 38 (18.5%) 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	Steel stringer or multi-beam girder
Length	about 389 ft
Location	0.6 E Jct Sd 109
NBI structure number	000000026379024
Condition class	Fair

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
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
I029 S over 152 St	1977	3,605	Fair