RleeP, good Post on SM fishing.
Paul,
First of all, my favorite way to fish SMs is with a popper on top. Sometimes I’ll try that first to see what happens, but it’s not usually the best way to catch them, it is the most fun, at least for me. Poppers, sliders, or any top-water fly is usually best early and late in the day without direct sunlight on the water, in shaded areas, or with cloud cover. With that being said, I’ve fished many bright sunny days where the fish hammered poppers throughout the day.
Probably the best approach for fishing SMs is to tie on a medium weighted bugger, Clouser or similar type fly. I usually start by casting quartering downstream and swing it across the current and strip it back upstream after the drift. Sometimes the fish can’t resist your fly when you let it hang in the current at the end of the drift, so try that too. Try both swinging without stripping, and active stripping throughout the drift to get an idea of what the fish want that day.
If this active approach doesn’t work, I will start to quarter my casts upstream, and dead drift my fly by high-sticking it like RleeP described. After the line passes my position, I let it swing downstream and employ the active tactics as described above. Take note of when in the drift you get a hit, and how you were manipulating your fly.
You can cover the water like a blanket, if after each cast you take a small step downstream and repeat the process. When dead drifting, to cover the water completely, I usually make three casts before stepping downstream to cover all the water - a short, medium, and long cast and then move down and repeat. Take a few extra casts in fishy looking areas and vary your fly manipulation. If you do begin catching fish, stay put or move more slowly since SMs have a tendency to cluster in a certain area.
My staple fly is an olive and black wooly bugger, but sometimes fly types and colors does matter. Try black or dark colored flies, especially on early and late and if the water is stained. Also try chartreuse, white, yellow and brown.
Some of rigs I use, I tie on a large BHHE or big weighted stonefly with rubber legs for dead drifting, and fish it behind a weighted bugger, leech, or similar fly. Also I have a lot of success using a good-sized popper with a lightly weighted bugger or nymph on a 2 ,3 or 4’ dropper. The popper works well as a striker indicator as well as being the target fly, and the rig covers the water from top to bottom.
FF for SM is a blast and a great alternative to trout fishing the summer.