The hex hatch has been very thick the last two nights.  That can be a good thing or a bad thing.  If it's too thick your fly is simply outnumbered and your odds are pretty long.  We've also been dealing with changing winds during the hatch.  We had it just right the last two nights and had a ton of action.  Dan from Folsom landed several fish over 18" tonight and hooked half a dozen more.  The wind made things tough at first, but the trick is to find a place where the wind concentrates the bugs.  That made for good fishing for about 20 minutes, then the wind died and we were able to cast into the glare of the setting sun for the rest of the hatch.  The hatch started really late but it was really good.