Just outside the San Juans, North side of Guemes Island we catch lots of flounder, sanddabs and sole which we use as live bait for lingcod fishing in the Spring.
Don't know if they're there all year long, but worth a try. Chunk of chicken and skin pulled over a medium size hook and a 6 oz sinker a couple feet above, In 20' to 30' of water, drag it along the sandy bottom. If there is wind or tidal current anchor once you get into them. No rock fish, but there are the occasional sand shark and crab.
In the area of 48.33.39 N - 122.35.52 W
Careful . . .I Have a Generator and I'm not afraid to use it !