I've been fishing the Sierras for around 10 years now and have gotten to know the area fairly well. Here's a hatch chart that the Cutters put together for the area
California School of Flyfishing, Nevada City and Truckee, CA > Fly Patterns > Hatch Chart
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Here's a little blurb on the Reno Orvis site for the Truckee
Aquatic life: BWO (All Season), Little Yellow Stone (April-June), Green Drake (May-June), Golden Stone(All Season), March Browns(March-May), PMD(All Season), Caddis of every shape, size, and color including Oct. Caddis(June-Oct), Midges(All Season), Sculpins(All Season), Crayfish(All Season)
Flies: Drys - E/C Caddis, Elk Hair Caddis, Parachute Cahill, Parachute Adams, Gunnison Green Drake, Stimulators, Sparkle Duns.
Nymphs - Caddis Pupa, Pheasant Tails, Prince, Hares Ear, Bird Nest, Peacock Terminator, Kaufmann Stone, Polyfitus, Micro Mayfly
Streamers – Buggers, Crayfish, Nutcracker, Muddler, Zonker, Zoo Cougar, Clousers, Double Bunnys, Bandit Leech, Chuck and Duck