you mentioned you had 55 gpm??? Is that true? IF so, 55 gpm = 3,300 gph and 79,200 gallons per day, more than enough to raise trout.
But Mike the kicker is his pond is one acre. Too much surface area to keep cool enough even with that kind of flow.
I agree 55 gpms is a good flow but if Waterloo wants to raise trout year around he will have to dig a smaller pond to flow it into. He could overflow it into his bigger pond with no probems.