Hiway #14 from Midland to Philip was good with very few scattered snowy spots this afternoon.
I'm 8 miles north of exit 170 on I-90 and had family members drive from IA/SD state line on I-29 and I-90 with good roads except some snow from Mitchell to Chamberlain two days ago.
You can probably just check with DOT in each state on the internet, or if in SD, you can call 515 for road conditions.
Good traveling! Hope you can avoid the areas which had severe storms, whether rain or snow on your trip.