Assuming the water isn't frozen Craig, I would just try to spot anything moving near the surface.
If you do see movement, try and put a dry fly as close as possible, it may work, if not twitch the fly a bit to induce a take.
Start with something black and be prepared to try a few patterns.
Good luck.

PS Nice post by the way, keep it up.
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"A glint of sun has warmed the air,The flies will soon hatch out, To lure and tempt from their deep lair, The bonnie speckled trout."
SKB tackle supporter. I love Furled Leaders.