Here is a link to the WDFW for their weekly catchable trout plant info. This can be a useful tool when planning trips to the lake or for historical plant patterns at local fishing spots.
The WDFW just released the 2009 catchable trout planting schedule. Two lakes slotted for large kokanee plants are Banks Lake in Grant county with nearly 150,000 (8-12") sometime in April, and Lake Roosevelt with 475,000 (8-12") scheduled to be released by May.