Check it out — winter pheasants in South Dakota. Great dogs wood, great birds. And its all on public land.
I was doing a bit more research into winter time grouse foods when I came across this: Winter Food Habitats of Ruffed Grouse in Young Aspen Stands. This paper is based on finding from a 1972-1973 study of 10-15 year old clear cuts in Oneida County, Minnesota.