Last Updated: March 6, 2026
The Hoover Dam is one of the most famous engineering structures in the United States. Built across the Colorado River between Nevada and Arizona, this massive concrete dam has become a symbol of American engineering and innovation.
When visitors see the dam for the first time, they are often surprised by its enormous size. This leads to a common question: how tall is Hoover Dam compared to other dams around the world?
While Hoover Dam was once the tallest dam in the world, many modern dams have since surpassed it in height. Even so, it remains one of the most impressive and historically important dams ever built.
Short Answer
The Hoover Dam stands 726 feet (221 meters) tall from its base to the top of the dam. When it was completed in 1936, it was the tallest dam in the world.
Today, Hoover Dam is still among the tallest dams in the United States, but several dams around the world are now taller, especially in countries like China and Switzerland.
Long Answer
The Hoover Dam is classified as a concrete arch-gravity dam, meaning its curved design helps distribute water pressure into the canyon walls.
At 726 feet tall, the structure is still enormous by modern standards. To understand its scale, it helps to compare Hoover Dam with other major dams around the world.
Key measurements of Hoover Dam include:
- Height: 726 feet (221 meters)
- Length across the top: 1,244 feet
- Thickness at the base: 660 feet
- Thickness at the top: 45 feet
Even nearly a century after its construction, Hoover Dam remains one of the largest and most recognizable dams ever built.
How Hoover Dam Compares to the Tallest Dams in the World
Although Hoover Dam was once the tallest dam in the world, modern engineering has produced several dams that exceed its height.
Here are some of the tallest dams globally for comparison:
- Jinping-I Dam (China) – 1,001 feet tall
- Nurek Dam (Tajikistan) – 984 feet tall
- Xiaowan Dam (China) – 958 feet tall
- Grande Dixence Dam (Switzerland) – 935 feet tall
- Hoover Dam (USA) – 726 feet tall
While these newer dams are taller, Hoover Dam remains historically significant because of the time period in which it was built and the engineering challenges it overcame.
How Hoover Dam Compares to Other U.S. Dams
Within the United States, Hoover Dam is still one of the tallest dams ever constructed.
Several other major U.S. dams include:
- Oroville Dam (California) – 770 feet tall
- Dworshak Dam (Idaho) – 717 feet tall
- Glen Canyon Dam (Arizona) – 710 feet tall
- Hoover Dam (Nevada/Arizona) – 726 feet tall
This means Hoover Dam remains one of the tallest dams in the country, even decades after its construction.
How Tall Hoover Dam Feels in Person
Standing at the top of Hoover Dam gives visitors a powerful sense of its scale.
To understand just how tall the dam is:
- It is taller than a 60-story building
- It rises 726 feet above the Colorado River
- The drop from the top to the river below is nearly three times the height of the Statue of Liberty
Looking down from the top walkway can feel dramatic because the canyon walls and the river far below emphasize the dam’s vertical height.
Why Hoover Dam Was So Impressive for Its Time
When Hoover Dam was completed in 1936, it was considered one of the greatest engineering achievements in the world.
The project was remarkable because:
- It was built during the Great Depression
- It required millions of cubic yards of concrete
- Engineers had to divert the Colorado River to build it
- Construction took just five years
At the time, no structure of this scale had ever been attempted in such a harsh desert environment.
Because of these challenges, Hoover Dam quickly became a symbol of American engineering capability.
Seeing the Hoover Dam Up Close
Today, Hoover Dam attracts millions of visitors every year who want to see this historic structure in person.
Visitors can walk across the top of the dam, tour the interior power plant, and view Lake Mead, the massive reservoir created by the dam.
Many travelers explore the area through a Hoover Dam tour from Las Vegas, which offers guided visits that explain the dam’s construction, history, and importance to the American Southwest.
Seeing the dam from the observation points on both the Nevada and Arizona sides provides a full appreciation of its height and scale.
Bottom Line
So, how tall is Hoover Dam compared to other dams?
The Hoover Dam stands 726 feet (221 meters) tall, making it one of the tallest dams in the United States. While several modern dams around the world are now taller, Hoover Dam was the tallest dam on Earth when it was completed in 1936.
Even today, its massive size, historic importance, and role in shaping the American Southwest make it one of the most impressive engineering structures ever built.