I think I'm qualified to answer as I still have my club patches somewhere around the house here in Woodinville WA. Yes, they still cast there, and yes there are some very dedicated spey casters there, including Mel Krieger . As to days and times, that's another issue. Go on a nice weekend day, and you will find the clubhouse open, and you can go in and find out hours and such, and who speycasts and when.
Otherwise the ponds are always open and you can just go and cast whenever you want, and you may run into people, and there may be a member who has the key to the cottage, and there may even be a spey caster around.
For your first time, I would go on crowded weekend just to find out about joining, and casting events, etc.