I believe the state record trout was caught out of that canal. One of these days I will make the trip and fish it.To answer your question, no. Never been.
I'm not much of a fisherman myself, but the best trout spot I've stumbled upon is at Lake Ogallala, across the dam from Lake McConaughey. There's a point where the lake, a canal, and the Platte River all damn near meet. From the canal part my dad and I both pulled our limit of trout in the amount of time it took to get a sunburn on the tops of my feet. There was some fellows pulling big ol' channel cats from the same spot.