I fished/guided Hosmer yesterday on a cold and rainy day and it was just terrific. There was a good afternoon callibaetis hatch and the fish were on them. It is nice to go there on days like that to escape the crowded conditions Hosmer typically sees these days with all the kayaks and paddle boards. 
Damsel Nymphs, Red 2 Bits, Leeches, Small Chironomids and Zebra Midges, Ants (should be flying ants there this week coming up with the hot weather!).