Victor, welcome to the forum! You will get your questions answered here.
I agree with pond dragon that 8 feet with aeration will be sufficient for overwintering fish in Canyon County.
I lived for nearly 15 years on the Snake about a mile upstream and across the river from Marsing in the '80s and '90s on the sole corner on Lloyd Lane. That was my first piece of property and I'm full of memories from there. I expected to build a pond there one day, but the sandy soil, and 350 feet of riverfront out my back door delayed my ever getting to the pond project.
