If you have trouble getting your nymphs to sink quickly as soon as you make your presentation casts you may by whipping them dry when you make false casts as you make your measuring casts. An easy way to correct this problem is to make your presentation casts on your first forward cast as you pick your nymph up from the last drift.
Many brown trout begin feeding actively in the large streams in the fall. One of my most productive tactics to catch these trout is to fish a big nymph such as a Bitch Creek Nymph 8 or a Murray’s Olive Road Kill Nymph 8 upstream dead drift right below the heaviest riffles. I started doing this many years ago on the Yellowstone River just upstream of Livingston, Montana and even my guide, Ray Hurley, could not believe how many large trout fell to this tactic.
I wade into the riffle corner 100 feet below the riffle and fly fish these big nymphs upstream so they drift back downstream on a dead drift just like a real nymph would if he were caught by the current. I like to keep my cast shorter than 30 feet because it is imperative to see these strikes on my indicator system. To help see these strikes I use our Bright Butt Leaders and space two Scientific Angler Indicators along them.
I fish these riffles thoroughly by wading as far out in the river as possible and wade upstream as long as the riffle is three feet deep.