Longtang Dam
The 928th tallest dam in the world
The Longtang Dam, also known as Longtang Reservoir and Nandu River Dam, is located on the Nandu River at Longtang, Hainan, China. When the water level is low enough this concrete dam serves as a river crossing for vehicles and pedestrians. The dam has a normal water level of 7.7 metres. At 11.5 metres, an alert is issued. When the dam is closed, large metal doors are lowered at each end to prevent access. The dam also has hydro electric stations on both banks.
Dam data from Wikidata (CC0) plus curated additions. Summary from Wikipedia (CC BY-SA).