I am interested in a trout pond also. There is so much literature out their on trout pond you will get ideas galore. The one lake in my area that is stocked by the state has the biggest population of trout I have ever seen. It is stocked with browns, Rainbows and brookies 8 times a year. It is nothing to catch 50 trout on each outing. The lake is approx 50 acres and varies in depth from 1 to 18 ft. The trout in the summer stay in the main channel at around 15 to 18 foot. The lake is fed by a stream that is nothing more than a trickle in the summer.
My thoughts/plans for my pond are 1.5 acres average depth 15 ft, max depth 20 foot, 3/1 sloped sides. I have a little 35ft x 35ft pond (spring fed) currently that will flow into it. I did have trout in it since the end of July with no problems but have since transported them to my uncles farm to restock his lake. I stocked 10 pounds of Fathead's in the little pond and figure they will eventually propagate the bigger pond on their own. By the summer it should be black with Fatheads everywhere.