A basic rule of thumb for multi-nymph rigs is you stack your nymphs differently for pocket water than riffles. For a riffle or a shallow run, you usually put the lightest fly on the bottom. For deeper, swirly pocket water, you put the heavy fly on the bottom. It's a great technique if you only plan to fish short range in water that doesn't have a lot of snags. "Euro" is just another term for traditional high-stick nymphing. It's actually the oldest form of English fly fishing, from the era when gentlemen used 16 foot long billiard cues as a rod and 18 feet of silk and cat gut as a line. If you want to cover a wide run or pool and fish out farther than 12 feet from the bank, the standard one or two nymphs under a strike indicator is the more flexible setup and the dropshot rig is probably more effective at depth or in poor visibility. If your streams have a lot of wood in them, consider that multi-nymph rigs are prone to snag every damn unseen stick in the river. If you chuck your euro rig out past where you can read the bottom, it's like dredging with a grapple hook. If there's a snag out there, you're likely to find it.
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