I had a great day on the Lower Sac with Greg and Larry from Sebastopol.  They both landed some really nice fish.  There was a solid PMD hatch from about 1pm on and the nymph grab was quite good.  We did best on small brown mayfly patterns.  Greg even rose a nice fish on a callibaetis dry.  The river is down to 6000cfs now and should stay at this flow for a week at least.