Fishing on Chesterfield continues to be VERY good. Yesterday 7-15 was an unreal day of fishing, get up there while its hot! There are some huge fish in the reservoir and your almost certainly guaranteed an aerial display. The fish are hitting a variety of flies including leeches, damsels, chironomids, snails, you name it. Concentrate on fishing the before mentioned bugs on floating or intermediate sinking lines. The fish are up in the water column so a fast sinking line isn’t necessary.
One thing about Stillwater, change your presentation frequently! Very rarely can you catch fish on one presentation all day. The fish are constantly moving, especially in lakes, so you need to move as well. Sinking lines early and indicators later in the day is a good regime to follow.