Listen, if you're planning a retaining wall this spring in Elkhorn , West Omaha , Gretna , or Papillion , here's something most contractors will not tell you up front. Nebraska soil destroys walls between November and April. I've watched it happen on house after house. The clay holds water, the water freezes behind your wall every winter, and your wall takes a small push outward every single year. Three or four winters in, a bad wall starts to lean. Seven winters in, it bows