Looks like my son and I hit some of these "Tiger Trout" hybrids at Beehive Reservoir this evening, above Wenatchee. Hadn't fished Beehive in a while. Neat fish, very aggressive on the dry flies we were using!!!
I just found out about a reservoir just south of the Oregon border called Knott Creek which is suppose to house tiger trout up to 30 inches. Hopefully I can make it up there this fall and get some pics.