Check out the pond this summer. Every week take temperature readings of the stream and of the pond. You will have to lower the thermometer throughout the 17 ft to determine where the thermoclineforms in the summer so you can see how much room the fish will have to live and the temp that it will be at. Alot of ponds have no oxygen below the thermocline but that will depend on the physical makeup of your pond, the temp and current of the spring water entering the pond and plant life that exists. if you have plants living in the deepest part of your pond (17ft) throughout the year thats a good sign. With the cost of fish it would be worth your money to have someone check it out, ask the hatchery to recomend someone. I would also recomend from my own attempts to stock a pond that you seriously consider planting the usual bass, sunny,minnow mix as its much less demanding and will eventually balance out and take care of their feeding and reproduction themsleves. You can throw a few pickerel in for fun(caught small onesat a localpond and tossed them in)as they can get decent size if left alone and kids love to see the teeth on those things. Trout will always cost you money and time (feed)and will never really thrive though your pond/geography maybe the exception.If you notice, everyone with a trout pond has to "restock" every year though supposedly the fish are doing fine.
From my experincedon't count on finding the dead fish as alot of stuff will eat them as quick as they die unless your there everyday to check/feed the pond. In retrospect I would never have wasted money on trout as the few months they lived for me It would have been much cheaper taking the kids to a pay lake and more enjoyable. Spending abunch of cash to catch8 to10 inch pellet eating troutwithout even the hope of landing a decent one that had the brains to actually run away from the thing reeling it in let alone pull on the drag was a big waste.(could only afford very few decent size ones and they died without me even catching them) Kids don't seem to care what kind of fish they catch. Hope it helps.