The Hoover Dam is a very large Dam and is ranked in the top 20 largest Dams in the worl.
But the Hoover Dam is not the largest Dam in the world as there is another even larger Dam in the world other than the Hoover Dam.
The actual largest Dam in the world that outranks the Hoover Dam in size is the Nurek Dam that is on the Vakhsh River in Tajikistan.
The Nurek Dam is 984 Feet Tall while the Hoover Dam is only 726.4 feet Tall.
Hoover Dam is a large Dam and still ranks in the top 20 of the tallest Dams in the entire world but it only does so only in the concrete gravity and arch categories.