1. Location. Majority of streams have an average of one trout per mile 20″ or larger. Some streams have none. You need to look for warmer water, often non-designated water. Do you want to catch 20 12″ trout or do you want to catch one 20″+ trout? I prefer the monsters. Consider fishing the lower ends of the rivers. Big trout have a large surface area and can withstand warmer water. Big trout may even live with other warm water species such as northern pike, or even catfish.
2. Food. Let’s face it a 6 lb trout is not interested in flies. He is interested in eating other trout, chubs, frogs, mice, you name it. Sipping #24 tricos would be a waste of time for this fish. Call me a Neanderthal, but consider live bait. I know many who have caught giant trout on crawlers. Better yet, catch chubs or suckers and use a 3-4″ tail with a larger hook such as a #2. If you are worried about mortality, consider a circle hook. For lures I like a #5 brown trout rap. I also like #6 or #9 Panther Martin deluxe all silver. For fly fishing use a streamer, wolly bugger, or even a mouse pattern. Something big and meaty looking…
3. Timing. Big trout are survivors. They are not going to take chances by being eaten by predators. Fish at low light. This means a one our before sunrise or one hour after sunset.
4. Approach. Stealth mode. When you find a hole with big fish you want to approach with extreme caution. Crawl through the grass. Remember a fish has a V shaped cone of vision looking up. If you are up on tall banks they will see you. In this situation, better to slowly wade from downstream up. Learn from the great blue heron.
5. Patience. Don’t give up so easily. If you spot fish and find some big ones and know they are there, stick it out. Don’t go hole hopping. Better to stay cool. Patience is a virtue, especially when fishing for trophy trout in low light. My experience tells me big trout are territorial. In larger river systems, some may migrate to spring seeps in the heat of the summer, however majority of time trout live in the same hole year after year. Take a big one out, the next biggest one moves in to stake his claim.
6. Gear. I used 10-12lb mono or braided line. I used a medium-heavy action IM6 blank pole that has plenty of muscle to keep a big trout out of the log jams. Leave the 2wt for the 10″ trout. Braided line casts a mile and IMHO is the best because it is very sensitive. Spinning reels with a good drag system also critical. Give your closed face reel to a kid. With spinning reels, you get what you pay for.
Hope to build onto this and looking for input from others!