I raise trout in a pond in northern Indiana so my climate is probably warmer in summmer and cooler in winter than yours. If you can keep your pond water between 55 and 65 throughout the summmer you should be fine. If not, you will have to add cooler water such as aerated well water. This is what I do in the summer. However my pond is small at only 88 by 59 feet and 9 feet deep so larger ponds would take more water. I pump up to 45 gpms (probably closer to 38 gpms) from May to September. I also feed my fish on a daily basis but if you want really big trout with a high survival rate that is the way to go. I've had browns and rainbows go from 14 to 16 inches to 22 to 25 inches in only one year. That is with virtually no growth during winter months. See my website at
http://www.ligtel.com/~jjbaird/bairdfish2.htm I have a copy of a publication sent by a frient put out by your state called "Trout Farming in Washington." The title is a misnomer as it is geared more to recreational ponds. It has a number under the title of EB756 and the friend that sent it to me put a number on it of 8248.
It's put out by the Cooperative Extention of College of Agriculture Washington State University. I'm sure you can find it if you do some digging and calling. At last resort I can sent you a copy, however,last time I did this I was deluged by requests.
Good luck and keep us posted.
