I don't have any pics scanned right now but 12 to 18 inches is average, and when they drained the lake above riffe all the kamloops were flushed to riffe, they were averaging about 2 lbs in '97. Same methodology...to catch 'em. Swofford is a good bet too. I usually fished the east end because it was much closer.
This time of year is a tough call, with the weather being what it is I would not figure on doing that well...once the weather evens out in late spring you are much better off, into late july to early August.