I used to clam a lot on Pool 5 and 6. You can find clam beds all over but they were predominately just off of the main current in a firm mud. I also found a lot in sandy areas but the quality of the bed was not near that of one located on firm silt. An other good location was sloughs that had decent current going through them. Depth was not a concideration, I found beds in two feet of water and in 35 feet of water….. Find a place with steady current and a semi firm bottom and you will likely have a clam bed some where in the area.