This was 10C, a pair of double sluice gates. The photo on the left was taken in 1906 and the one on the right in 2011.
Seeing the current situation at this location was the greatest disappointment that I had with this project. The gates are completely
gone. I do not know if they were broken up to get at the metal components or if wave action caused them collapse outward
and sink into the mud. Whatever happened, there is no visible trace of them today.