Early in the season last year, I would find them between 30 ft and right on the surface. They will be at multiple depths and it changes through the day.
Early in the season I topline with 150' setbacks and run my planer boards off the side of the boat when I want more than 3 rods in the water. It's a blast watching them do acrobatics behind the boat!
Early in the season you are bound to have a koke pull the line out of your hand while you are trying to get it in the DR clip. Always a thrill to feel it get tugged out of your hand!
I want to get my boat out as well. I have a new Airmar P66 transducer to install and I want to fix my rear carpet panel on my transom cover. This year should be a lot better than the last with a good crop of large 3 year fish!
Go to the camp ground by driving across the dam. There is one in front of the dam and that is where your dump station is. Keep your camping permit if you camp up on the west side across from the dam and your dumping is free at the dump station. It is a natural tank additive dump only. Its pretty nice at the camp ground across the dam.
There is a boat launch there and when the water is up your are on concrete and there are nice docks.
I have not fished for the kokes up there. However they are not real plentiful and and I do not know what size they run for sure. I usually hunt the browns in palisades. Bigger fish. There are also Mackinaw in there.