A dozen or so Brant northeast of observation deck, likely scopeable from Emeryville marina, three common loons, one in breeding plumage, lots of aechmophorus grebes towards middle harbor, cormorants carrying nesting material westward, peregrine picking pigeons out of the bay bridge, and *porpoises*?!?
This park only opened a few months ago, so hasn't received extensive birder coverage yet. Seems to be some good fishing and crabbing, though.
Sent from my mobile - please excuse nonstandard typography.