I would try to mix what I could. The best material is a sandy loam for a dam. Of course, the bottom parts can be pure clay. The potential problems come when the water recedes and the sun bakes the clay.

Last edited by Dave Davidson1; 03/29/16 08:01 PM.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP Grandpa