Make sure to be very careful where you put structure in WA. Some lakes it is okay, some it is permit only and a lot of them it is illegal or was when I checked middle of last year. The regulations are so crazy that you can actually be fined for removing weeds from the water to create a fishing hole. Removing the weeds can itself be illegal. Even putting in a dock can require a permit on most lakes.
Best bet is to find the office that regulates the lakes you are going to fish and call them. Check the link below for phone numbers. Or just don't get caught but I didn't say that.
WDFW
I love taking my kids fishing, now if I could just manage to fish at the same time.