Approach from downstream.
Make short casts beginning at the pool tailout. This way you're not casting over fish and spooking the entire pool.
This is even true with small stream bass. I've observed both smallmouth and spotted bass behave very much like trout in these environments – where they feed, how they feed, and even spawning behavior.
Less casting is better.
Pick your target as you approach the run. Casting repeatedly in such a small area is just that… casting. The opportunity to a hook a fish goes down with every cast in the same spot.
Make the first cast your best!
Slow down your retrieve.
I have to make this adjustment quite often. It can seem strange going from throwing a 300gr sinking line and 6” weighted streamers on big, fast-moving water to throwing smaller streamers on a floating line in a creek you can hop over!
If you slow down the retrieve and your streamer is designed well, you'll be able to strip and pause while still getting a lot of movement from to the materials themselves moving.
If all else fails to reap a fish, try high-sticking your streamer.
Learn new casts.
You'll be faced with lots of casting obstacles in small stream environments.
The bow and arrow cast can be your best friend! Just make sure you are holding the streamer by the rear hook if articulated – I know from experience!
Any cast that eliminates false casting is your best friend on these waters because it reduces your chances of spooking the fish.
When you don’t have time to rig the boat or you’re a little sore from swinging the big gun all day during full generation, grab your trout rod and some micro-meat, and go explore those places you drive by every day!