I'm a Warren Co NJ native and large browns are caught through this section of river down to Reigelsville - although I would say most are by a few anglers that really focus on it. Even then, it is never a numbers game. The tricks seem to be looking around trib mouths in the fall for spawners and finding spring holes in the summer. The summer tactic is to wet wade in areas where limestone meets the Precambrian gneisses and find the cold spots. Delaware River summer temps get into the 80s, so you really need to find the cold water refuges. Then fish these at night and hang on. Not sure if these are sea run fish, but it gives you a shot at a 2ft+ brown. Shad fishermen ocassionally hook a big brown in the spring, but these are by luck IMHO. I've seen the most browns caught while shad fishing the Walpack Bend, but then the Flatbrook comes in on on side and the Bushkill on the other. The people I'm aware of who target the big browns spend more time scouting than fishing. It's more hunting for big fish rather than fishing hard and you earn every fish. One exception was a guy who lived next to a spawning trib (like 50 feet away) and just looked in on his way to work each day - but most of us aren't in that position.