I always try and find where they sitting in thermocline which is easy if you have a fish finder. Some Browns can sit deep in it if they want but will also travel out of it for periods of time usually first light and well after the sun sets. If there are any springs at all in the res. they would most likely be found around it also. Any kind of cool moving water like spring creeks by chance droping off into or near much deeper water than to whats typical to the shoreline around it would be a target area too.