Jeff, I would contact the Idaho Dept. of Fish and Game or the British Columbia DFW as they seem to be the regions with the highest number of Gerrard planted waters.
In WA, there seems to be quite a bit of confusion regarding what is a Kamloops vs. a Gerrard. I have heard people mention both strains when talking about the fish in Lenice and other Basin lakes. I always was under the assumption that these were Kamloops and the only semi local waters with Gerrard are Pend Orielle, Kootenay River and Kootenay Lake. I could be wrong about this though so don't take that as fact! Mike
