Middlesex Filter Beds Weir
The 928th tallest dam in the world
The Middlesex Filter Beds Weir, or Lea Bridge Road Weir, marks the start of the Hackney Cut, an artificial channel of the River Lee Navigation built in 1770, in the London Borough of Hackney, England. The weir lies between the former Middlesex Filter Beds to the south, which are now a nature reserve, and the Thames Water treatment works at Lea Bridge Road to the north.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).