Longest dam
Who
Unknown
Where
Ukraine (Dniepr)
When
1964
The Kiev dam across the Dniepr, Ukraine, completed in 1964, has a crest length of 41.2 km. (25.6 miles).
The Yacyret  dam across the River Paran  on the Argentinian/Paraguayan border, due for completion in 1998, is designed to be 69.6km 43.2miles long. SIZE=2<>