Hosmer Lake is good fun in the upper lake and channel now. Soft Hackles, Damsels, Callibaetis Nymphs and Leeches stripped, and Chironomids, Scuds, Balanced Leeches and Red PT or “Cate” on the bobber rig. 
Dry flies to take include Callibaetis emergers, duns and spinners, Traveling Sedge (Goddard Caddis), Black X Caddis and Black Elk Hair Caddis (also suitable to match Alderflies), Damsels (including the exact match extended body versions we are all used to , but also blue chubby’s). Add some Ants and Beetles to the mix and fish those babies on the edges and over the weed beds. The Crow Beetle is a low floating version and is often #1 at Hosmer. Try it.