Reservoir flyfishing for trout is the most popular form of game fishing today. When starting to fish any reservoir, the first consideration is the weather. If the wind has been blowing in a particular direction for several days previously, it is safe to assume that there will be fish around the windward bank. If the day is cloudy and overcast fish are more likely to be at the surface than if the day is bright. These clues will help you choose the method and place to fish.
When boat fishing, you can use a rudder or driftcontroller if the reservoir rules allow. The method then would be to set the rudder so that the boat drifts along the bank, and to cast at rightangles to the boat. Allow the line to sink, and when it has gone through an arc and is straight behind the boat, retrieve your fly. Takes very often occur just as the fly is passing through the bend of the arc, because at this point it suddenly speeds up, and any to slow down, so you need to fish your lines accordingly.
The best way to fish in such conditions is to use a static floating lure, which works very well if fish are seen to be attacking the fry. When trout use these bulldozing tactics they charge into a thick shoal of perch or roach fry, catching one and swallowing it down and stunning perhaps four or five more, leaving the stunned fry feebly flapping on or near the surface.
If the water is deep from the bank, use a sinking line which will enable you to retrieve slowly without snagging, or a floating line with a long leader. That is, of course, if you need to fish deep. Use the same flies as you would when boat fishing.
One spot from the bank might be fished very thoroughly, so if nothing is contacted, it often pays to move along. When the wind is blowing onto the bank, the wave action varies according to the depth of the water. In shallow water, more of the bottom is stirred up, which might attract feeding fish. This is something always worth considering, so try all depths of water possible from the bank until you start catching.