I have been told by other boaters that they have had luck with both rock and dungeness crab in liberty bay. That being said I have never tried there myself.
We use to get Dungies of Illahee State Park Dock back in the late 80s. It was good for a couple dungies a day while fishing for Black mouth.
Until certain ethnic groups come in and wiped all the crabs (Dungies, Red Rock, etc.) almost over night by keeping everything that came up with their traps, along with most edible fish and mollusks. Saw the same thing happen at Port Orchard, Manchester, and Annapolis. They became dead of fish.
I have not fished there in 30 years, so I do not have any current information.