I have a problematic backyard. It's basically two inches of topsoil
on top of at least two feet of clay. It's also flat as a pancake and
lower than my neighbors' yards. Every spring it turns into a swamp.
I need three or four days of dry weather before I can even attempt to
mow it, which is not much of a problem because nothing grows there
very well except nettles.

I'm planning on getting a big load of topsoil to "dome" it, but I
really need to do something about the clay. They say the best thing
to do with clay soil is to work "organic material" into the clay. The
most readily available organic material ( that I don't produce myself!
) is mulch, basically wood chips. I would much rather go with some
kind of compost. Where does one go to find a truck load of compost?

BTW, I live in SE Michigan, if that helps.

Thanks,
Ven Hawkins