get on texas parks and wildlife website, they show they stoking schedules and how many and what size. most of the fish are around 10" but i have seen much bigger caught. i would rec. getting there a day or two after stocking, thats when i have usually had the best results. have caught plenty off 306 around the loop area, make sure to repaort anyone keeping more than their limit, trust me you will see them around the cayon dam tailrace area.
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WATCH OUT FOR THE J.T. HOOKSET!!!