Ray,
As you know, Crab Creek meanders all over E. Washington. Depending on the
section you try and fish, the results will very greatly. Most of the success
I have heard about and experienced personally have been around the Harrington
area. Many of the great stories about BIG fish come from private property in
this area.
We know there are some large trout in the Potholes so stands to reason that
the inlet could provide some good fishing. I have no idea if it is even
accessible by anything other then boat. You may find warm water species
and/or scrap fish present too. I hear that from the Potholes down to the the
Vernita area is more warm water species but haven't fished it personally.
Sorry I don't have more specifics for you but it is a long and varied stretch
of water. Maybe try contacting a fly shop in Moses Lake and see what info
they give you.
Mike