I think that the Tigers have just been stocked or maybe not quite yet. They were selecting where to stock them this summer and at this point they might have put them in, or might still be doing that through the end of the summer/early fall? I'm not entirely sure.
Here's a listing I found though that might or might not be accurate.
http://afgmag.com/tiger-trout-update-july-3-2015/
Scroll down for the list at the bottom. Unfortunately most of these places don't look very close. I think that the Chain Lake referenced there is up north somewhere and not the one west of Nanton.