M_Boats: Flathead Lake, MO.

My wife and I are wanting to head to Flathead Lk. in Montana this summer for some sailing. I have a M15 and would trailer it there from Bend, OR. I am looking for anyone who has info on the marinas or campgrounds with docks on the lake. I would like to leave the mast stepped for several days and in a slip if possible. In looking at info on the lake there does not appear to be a marina except in Finley. And its a small one. And if anyone is planning on heading that direction this summer, please let me know so we can do some sailing together. Thanks