If the water is clear in the Ivishak, you'll see them. If you time it right, you'll see lots of 'em. I found char in any of the deeper water / pool areas but the most active fish to catch were at the tail end of the pools. If you're fishing in late summer before they're spawning they'll be quite aggressive so lure selection isn't terribly critical. I caught them on anything that flashed in front of them.