Yes, you can anchor overnight on North Lake Tahoe. You can find places in both the east and west basins that allow you to do this. The east shore is heavily forested, so you may not be able to camp at the beaches within the park. The rest of the lake is open to the public, and you are free to anchor wherever you want. As long as you have a large boat, you can usually anchor anywhere on the lake. There are some restrictions, though. If you plan on spending the night on your boat, you may not anchor in a marina channel, within 200 yards of a swimming area, or in a creek feeding the lake.