Junk at the wharf

After my meetings one day while in San Francisco, I walked around the Embarcadero, just trying some different things with the camera.  I found a little alley that was tucked away, and which headed towards the water, so I took it.  After a few turns I found myself looking upon this wharf, full of discarded boat junk, I guess.  Not being a boater, I am not much for identifying all these things, but I think the things piled up on the right are some kind of crab trap maybe?  Anyways, I liked the look of it - sort of the marine version of urban decay.