An LA Mystery: 1912

This mysterious shot was found amongst my father's belongings. The marker appears to be concrete, so we can assume he probably didn't find the Titanic, It would be safe to assume this shot was taken somewhere in the Los Angeles Harbor or Catalina, his favorite dive spots.

Coincidentally, the LA Harbor was undergoing improvements in 1912. Businesses like canneries, oil drilling and shipbuilding were growing so quickly that the city decided to dredge and widen the main channel. There was also work being done on the breakwater in 1912, which probably involved cement (Port of Los Angeles). To add to the possibilities, "In 1912 the Southern Pacific Railroad completed its first major wharf at the port. (Wikipedia)"

Calling all sleuths, history buffs, scuba divers, cement contractors and harbor experts - where is the marker for 1912?

Photo by Barry Thompson