The Hoover Dam was built on which river?

Here is the question :

THE HOOVER DAM WAS BUILT ON WHICH RIVER?

Here is the option for the question :

• Ohio River
• Missouri River
• Colorado River
• St. Lawrence River

The Answer:

And, the answer for the the question is :

Explanation:

[STC005519] The Hoover Dam straddles the border between Arizona and Nevada, diverting water from the Colorado River into Lake Mead, the country’s largest reservoir. Constructed in under five years during the Great Depression, the Hoover Dam was a marvel of modern engineering when it was completed in 1931.