Our guide Micheal was guiding at Hosmer Lake this week and he had good fishing on callibaetis, especially on the callibaetis cate nymph. He was using it stripped on an intermediate line and under an indicator. The mayfly hatch was good and the fish were up eating duns, but Micheal also said he was getting some fish up to eat a chubby. That’s always fun in the lakes. 
Alderflies, traveling sedges, beetles, ants and caenis mayflies (dusk and dawn) and damsels are all important, plus leeches and scuds can be tremendously important flies for hosmer too. 
With the low water a single nymphs under a small indicator is great, usually 2 to 4 feet is all you’ll get without putting the fly down in the moss and weeds. Jigs and balanced flies are a hit here!