Hello, Lon and welcome. I think you will like it here and glad you found your way back.
Hubby and I lived in Northern California before moving to Arizona. I'm very familar with Sacramento and the Delta (had a boat). I've seen some of the excellent work of the Capital Wood Carver's in Chip Chats Magazine.
I really like cottonwood too, and have created some pieces from it. I have the feeling that we have the same species of cottonwood in common. Here it is called Fremont Cottonwood and it's range also cover's California. I haven't actually carved with the bark only. My carvings are from the root and limbs. But, I would like to try my hand at carving the bark also. Like you, I also collect my Cottonwood from the banks of washes and rivers. Maybe you can give me/us some tips on carving Cottonwood bark, and sure would like to see some of your carvings.
Here is a helpful link on uploading images to WCI message board forums and gallery.
Posting Photos
Kathy