In the past I provided a link to buy an annual or day use pass for those camping/4wheeling in these two states.
http://www.naturenw.org/
The above link no longer sells them, so I will provide the new link in this thread.
I am buying my new one since it expires in June.

A popular area is the Mt. Baker-Snoqualmie National Forest which includes Greenwater and Evans Creek, two popular 4wheeling and camping areas that member from the PNW often visit.
http://www.fs.fed.us/r6/passespermit...almie-nf.shtml

Here is the link to buy an annual forest pass.
http://www.fs.fed.us/r6/passespermits/nwfp.shtml



They also have an online tool that lets you decide if you need any other pass type too listed on this page.
http://www.fs.fed.us/r6/passespermits/index.shtml