As a very nearby local, nobody has ever referred to it as Mactaquac Lake; probably because it's not a natural still water body. It's only ever been referred to as the Headpond or Mactaquac Headpond. I remembered that Openstreetmaps prioritizes the on-ground situation and put the Headpond as the main name accordingly; I have however kept the Mactaquac Lake as official_name= (as it is what is it listed as in provincial documents) and Mactaquac Headpond as redundant loc_name=.