Fish don't want to waste a lot of energy to stay in a current, but when they are open to feeding they love to be where food washes out of a current and is presented to them for easy pickings. I would too. Plunge pools, eddys, backwaters, around logs, and behind boulders are all excellent places to find stream flow seams and pretend your lure is also seeking out a place to take a break from the current.
Here one waiting for a snack...
Wanna avoid spooking fish and present your lure to look like a real fish?
Guess which way is upstream?
Small fish almost always stick to the stream margins where there is lower stream veleocity. Sticking to the banks also provides a measure comfort by providing cover from predators both in terms of water column and as well as have a whole bank side to not worry about...except for maybe getting picked off by herons.
It's a tough life! It's no wonder juvenile fish always have that scared look in their eyes and usally move under cover of night.
Instead of spooking them by dropping lures directly into these spots, try to present them by casting upstream and floating downstream into these seams.
Practice reading the surface flows and you will be rewarded.
(Photos Courtesy of BLM Fisheries Oregon, BLM Fisheries Idaho)