Most powerful waterfall in North America: Horseshoe Falls
A section of Niagara Falls earns the title of most powerful waterfall on the continent. Niagara Falls is made up of three separate falls: Horseshoe Falls, American Falls and Bridal Veil Falls. Horseshoe Falls is almost entirely on the Canadian side of the boarder and is easily the most powerful of the three; it's also the most powerful on the continent.
Around 90 percent of the river tumbles over the 173-foot-wide and 793-foot-wide Horseshoe Falls, an amount of about 600,000 gallons per second during the day. (The rate changes at different times of day because the river is used for hydroelectric power generation.)