Lake Billy Chinook is producing good catches of Bull Trout up in the Metolius Arm. You need a real boat with a good motor to safely navigate that huge reservoir if you launch at the (main) Crooked River Launch. It is possible to watch the weather and go in from Perry South with a smaller boat, but watch the wind forecast for the day and plan accordingly to stay safe.
The Deschutes Arm is fun too. Easy launch and fishing access there. And plenty of Bulls there, mixed with Browns, Rainbows and Smallmouth. Lot’s of streamer options for any of these fish.