Mike caught a 13lb Rainbow Trout Posted on October 12, 2012 at 7:54 pm. Written by admin Caught by Mike on May 20, 2012. A Rainbow Trout weighing over 13 pounds, 28 inches long. This beautiful rainbow was caught on a size 16 caddis. Dry fly-fishing is excellent in May and June. Leave a Reply Click here to cancel reply. Name (required) Email (will not be published) (required) Website Comment