The United States Rivers Water Flows Map Shows That The Country has over 250,000 rivers. Those Rivers provide drinking water, irrigation water, transportation, electrical power, drainage, food, and recreation. The main stems of 38 rivers in the United States are at least 500 miles (800 km) long.
According to the River Map of the USA, The longest river in the USA is the Missouri River; it is a tributary of the Mississippi River and is 2,540 miles long. But the biggest in terms of water volume is the deeper Mississippi River.
Seven Major Rivers of the USA cross or form international boundaries. The Yukon and Columbia rivers begin in Canada and flow into the United States.
The Milk and Saint Lawrence rivers and the Red River of the North—begin in the United States and flow into Canada. From this 3 rivers, only the Milk River crosses the international border twice, leaving and then re-entering the United States. Colorado and the Rio Grande river begin in the United States and flow into or from a border with Mexico.
United States Rivers Map
United States Rivers Water Flows Map
| River | Length (km) | Length (miles) | Drainage area (km²) | Outflow | Countries in the drainage basin |
| Missouri River | 3,767 | 2,341 | 1,300,000 | Mississippi River | USA |
| Mississippi River | 3,734 | 2,320 | 2,981,076 | Gulf of Mexico | USA |
| Colorado River | 2,334 | 1,450 | 637,137 | Gulf of California | USA, Mexico |
| Columbia River | 2,000 | 1,243 | 668,000 | Pacific Ocean | USA, Canada |
| Ohio River | 1,579 | 981 | 528,100 | Mississippi River | USA |
| Arkansas River | 2,364 | 1,469 | 435,123 | Mississippi River | USA |
| Snake River | 1,735 | 1,078 | 278,450 | Columbia River | USA |
| Saint Lawrence River | 1,197 | 744 | 1,344,200 | Gulf of St. Lawrence | USA, Canada |
| Rio Grande | 3,051 | 1,896 | 471,900 | Gulf of Mexico | USA, Mexico |
| Yukon River | 3,190 | 1,982 | 854,700 | Berin Sea | USA, Canada |