Unless a bunch of crap washed in and is stuck in front of the launch in the creek you should be fine. I'd still try to avoid minus tides. you can call Skamokowa Center or Vista park to get some current info. Actually if the weather gets really crappy you can get a nice room and breakfast (or a sack lunch) from Skamokowa Center for a reasonable price. When my Dad came down last year we stayed there several nights (he's not much of a tenter) and enjoyed it...even moored the boat at their float in the creek. I haven't been down there since fall so calling could be prudent...have fun, I'm getting awfully homesick this time of year.
Guess I'll have to watch the Fred Meyer ads in Salt Lake for springer on sale.