While the document you provided is interesting to read, currently you will be ticketed or worse, as per the 2006 ruling cited in the article. Unless you are planning on taking the State of Washington past the court of appeals, it appears the current interpretation (wrong or right) of the law as of the 2006 ruling is that the OP can do as described above and can depend on the state to enforce it. You can argue with the land owner or arriving officer, but you will loose, at least initially and for the foreseeable future. Public trust doctrine is in no way limited to Washington State and most states face this issue with sportsmen and land owners. Sadly, sportsmen of principal rarely can stave off the wishes of men of means.