A group from a Three Mills Rally looking at the lock. Note the infestation of Floating Pennywort, in the Old River Lea beyond the lock gate, which took over the water here in the summer of 2000. A ecologist's report says that the only way to get rid of it is by dredging it out. The coincides with the severe need for the loop of the Back Rivers to be dredged. At the time of writing (October 2002) this has started..