Carthagena Weir
The 928th tallest dam in the world
Carthagena Weir is a weir located at Broxbourne on the River Lea. The well oxygenated water with depths ranging to over 16 ft, makes it an ideal environment for coarse fish including the common barbel.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).