As a SD native, I too have had my share of "ditch hunts" - and can find a LOT of birds that way...in fact many an opening weekend has been spent on county roads off the beaten path!
For Teddee5 - Dont know where you are getting your atlas, but SD also publishes a free atlas of huntable land:
http://www.southdakotahunting.com/do...aps-atlas.html
My recommendation - check with the local chamber in Gregory, Chamberlain, Mitchell or Huron - they should have a list...if not, check the SouthDakotaHunting.com website for a list of outfitters...they may have reduced rates for weeks other than the opener!