Was looking through these old posts and saw this. It's legal on waters to do this from what I know of, there may be some lakes or places where it might not be, so I'd call wdfw and check with them on an area where you're thinking about doing it. I've never built any before but I'm thinking I might try it this year on a few lakes I know have crappie in em around my area. I remember in Washington's F&H magazine a couple years ago they talked about using old christmas trees to sink in lakes for structure.