That raised structure in the middle of my yard is currently known as a raised snow elevator. The slightly smaller mound in the front would be the same level of snow on the seat of what once was and will be again a picnic table. You will note the snow on the ground exceeds the level of the top of the seat. I calculate around three feet deep, although I am not going out there to find out. It will be interesting to see if the remains of the seat are lost when the snow eventually stops.