Formerly gravel workings, the lock gates are the upper gates of a full pound lock for barge access, whose lower gates have now been removed. It seems to have been built in about the 1920s. Navigation through the lock seems to have been abandoned, the gates are loosely tethered together, so that the current function seems to be to take in the tide and pen it.
TQ1672 : Thames Young Mariners, Ham Lake
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