Report: The river looks good, however it is warming, so you will want to go higher up in the system. Castella and above would be good. The Poxyback Golden Stone is a good fly or float a Chubby Chernobyl for some surface action. Darker nymphs such as Eng things, Amberwing Prince Nymphs, black Micro Mays and Zebra midges are also working well. Focus on the faster, deeper water for the best results! 

Upper Sacramento Flows at Delta

Hot Flies:  
Dry Flies:
D&D Cripple - March Brown, Low Water Baetis - #18, Adams - #12-20, Mercer's Missing Link - Dark #14-16, Parachute Adams - #14-18 

Nymphs/Wet Flies:
Mercer's Tungsten October Pupa, Morrish October Pupa, Skip's TB October Caddis, CB Birds Nest - #10-14, Red Copper John - #16-18, Zebra Midge - #18-20, Mercury Black Beauty, Mercer's Glass Bead Micro May - #22, Mercer's GB Dark Stone - #8, Mercer's Dark Stone - #6, Pat's Rubber Legs - Brown #6-8, GB Birds Nest - #12-14, Gordon's Amber Wing Prince - #12-18, Swink's BTS, Mercer's CB Micro Mayfly - #14-16 

Streamers & Leeches:
Sheila Sculpin, Woolly Buggers, Muddler Minnows - #10