Now I have never fished riffe lake but like for Merwin kokes
You fish bobber and jig for steelhead? Rig it up just like that but with a small hook. Find your depth. Have a nice sand shrimp on. Cast out there let it slide down and wait for that bobber down.
Now I have only gotten like 3 koks off the bank, but this is how others have told me to fish them off the bank.

Also a good size spoon works to. I seem to set the hook tho when using them.

If you wanna try the bobber thing and don't know how to tie one up, hit me an e-mail.
Just my 2 cents.
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