Welcome to the site, Rock lake has some really nice browns, I like to troll a size 13 countdown rapala in a gold color, I drove by a couple weeks ago when I was out that way yote hunting and there was several guys fishing from the bank, a couple had 20" browns. Mallows and worms. At Rufus black jigs working within 20' of the bank and or trolling anything orange. Flat fish work good or orange double whammies. Around the pens I also like to flip 3/4 ounce Steelie spoons and work them back toward me, lost one last year doing that on 6 pound test that was well over 20 pounds. Of course the ones that get away are always the biggest.

Good luck