Last time I caught a Whitefish was 1998...and it was on purpose. We made a trip to the Yakima in the winter for them, and I caught about 2 dozen of them. All on a single #16 Serendipity with a black thread body and bleached elk hair wingcase. Fished it greased in the film, and they were all over it. Had filled my elk tag so decided to go fishing. That was my last visit to the river before moving back east.