For many years vessels calls "Hay Scows" plied the San Francisco Bay and Sacramento Delta hauling all sorts of cargoes, one of which was hay for the fledging San Francisco Municipal Railway's horse-drawn transports and other needs "fueled" by hay.
This scow, I believe, is the "Alma," restored to her sailing best.  I shot this from my deck in Sausalito's Hurricane Gulch with a Nikkormat FTN.