We don't have synonyms for lock gate yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are lock-gate, back gate and lych gate.
(v) :
to place; to set in a particular spot or position; to designate the site or place of; to define the limits of; as, to locate a public building; to locate a mining claim; to locate (the land granted by) a land warrant
"the captives and emigrants whom he brought with him were located in the trans-Tiberine quarter - B. F. Westcott"
(v) :
to place; to set in a particular spot or position; to designate the site or place of; to define the limits of; as, to locate a public building; to locate a mining claim; to locate (the land granted by) a land warrant
"the captives and emigrants whom he brought with him were located in the trans-Tiberine quarter - B. F. Westcott"