I fished Hosmer Lake a few days this week, Wednesday was cold and windy and we just wrangled a few to the net. Tough. Thursday was much calmer and the morning was slower but Byron was able to entice some fish on a hover line and a damsel nymph, and then after lunch he whacked fish big time on a callibaetis cate nymph under an indicator. Friday was another slowish morning with some better bite in the afternoon but not nearly what I’d hoped for based on the day before. 
After the trip I called my friend Adison, fellow stillwater addict and guide and we talked it through and decided that all too often on lakes, what happened yesterday doesn’t really make a guarantee on what happens tomorrow. The fickle nature of the Stillwater game and how important it is to have many arrows in your quiver. Those arrows could be flies, different types of indicators that are more sensitive, land softer or that support more weighted flies in waves. It could be a myriad of sinking lines or a lighter tippet. 
In any case, Hosmer is a good bet now and I rate it as good! Throat pump samples showed damsels, scuds and a lot of daphnia this week. Callibaetis hatches were later in the day, about 2 PM. Yesterday morning there were Caenis (mayfly spinners) on the lower lake. I didn’t see any fish rising to them but I would recommend adding a Trico spinner or comparadun to your box for the next bit of summer. 
Alderflies were hatching thursday and friday and I saw some splashy rises that indicated the fish are eating them. And Hosmer is a good Traveling Sedge lake, and make sure to have some goddard caddis to skitter when the hatch is on either in the afternoon or evening.