We fished the North Jetty over Spring Break this year. First time for me since I fished it with my Grandpa before the Mtn. blew. Tried for Springers, and struck out. Limited on Black Rockfish and were one short of our Lingcod limit the first day. I had a dandy to finish out our Lings, but it broke off at the top of the "hoist". (There was no way to get down to net it). No crab, but didn't try very hard either. Only fished for a couple hours the next day, and only kept two Rockfish. We threw a couple Rockfish back a piece that just needed to grow more. Bring a LOT of jigs, as the rocks are...snaggy.
Never have fished the Westport Jetty, but have heard there are Greenling, and the Lings are bigger.
Be careful on that Jetty. My wife's boss had to get life flighted several years ago. A swell washed him into the river, and then the swells slammed him over and over until his buddies fished him out. Broken pelvis, and some cracked vertebrae. I think common sense is all a person needs, but those rocks can be slippery, and after fishing it, I can see how it could happen.