I took buddies Ron and John out on the Upper Sac today.  We did a noon-to-dark trip so we could fish the evening hatch.  It was a good call!  Nymphing was pretty good during the day and we had quite a bit of surface action during the evening hatch.  The hatch was a mix of caddis, little yellow sallies, and mayflies.  We didn't see golden stones, but got quite a few grabs on big dries nonetheless.  The big fish of the day was a brown trout about 18" that ate a big dry fly at dusk.  Wet-wading was very comfortable during the heat of the day but we switched to waders for the evening hatch.  We lucked out today and had two great sections of the river all to ourselves.