The South Dakota Departments of Transportation advised motorists that portions of Interstates 29 and 90 were set to close at 7 p.m., Friday, Jan. 17.

  • Interstate 90, east and westbound, will be closed between Mitchell (Exit 332) and Sioux Falls (Exit 395)

  • Interstate 29, north and southbound, will be closed between Sioux Falls (Exit 84) and the North Dakota border

The National Weather Service has issued a blizzard warning from 9 p.m. Friday until 3 p.m. Saturday for some counties and from midnight to 6 p.m. Saturday for others in the eastern part of the state. Snow and wind today have already made travel conditions hazardous in many locations. Heavy drifting is expected with winds gusting as high as 55 mph.

Many highways are ice covered, snow-packed and slippery, and visibilities range from one-quarter of a mile to zero. Travel is being strongly discouraged across most of eastern South Dakota well into Saturday. Drivers trying to avoid the closures are reminded that state highways and county roads will not be any better and may likely be worse, the Department of Transportation said.

The SDDOT said it will plow until early evening hours as conditions allow, and it is safe for the drivers. After that, winter maintenance will be suspended and will resume about 5 a.m. the next morning, weather permitting. With the significant forecasted snow totals and high winds, it will take some time for crews to get roads clear and open again. If an interstate is closed, do not assume other highways are in any better condition.

Up-to-date road conditions are available at or by calling 5-1-1.