These are the structures
10C, an overflow weir, and 10D, a double set of Sluice Gates. The
photo on the left was taken in 1906
and the photo on the right in 2011. The lake has been into the
canal and over the weir. The upright posts seen on the weir in
the early
photo were pieces of channel iron. Those were probably scavenged
for scrap iron.