Gino and I just finished up three days of guiding on the Bollibokka Club on the McCloud River.  What a place!  The lodging and cooking facilities are excellent.  When you drive into the property it feels like you're stepping back into history.  The river itself is the same McCloud you would recognize from the public water upstream, just bigger.  There are also more long flat sections and riffles.  There are definitely some large rainbows on the Bollibokka, although they are not easy to catch.  The McCloud River down there is a very physically demanding river and the fish are no easier to catch than on any other part of the McCloud.  The allure is the privacy, the diversity of water types, the trail system, the history, and the presence of some larger fish.