America has over 250,000 rivers

 The United States of America has over 250,000 rivers, totaling approximately 3,500,000 miles. The longest river in the USA is the Missouri River (it is a tributary of the Mississippi River and is 2,540 miles long). Still, the biggest in terms of water volume is the deeper Mississippi River. The longest undammed river in the contiguous USA is the Yellowstone River (it is 692 miles long).

Rivers provide drinking water, irrigation water, transportation, electrical power, drainage, food, and recreation. Rivers also erode land and carry it downstream to the sea. This kind of erosion can even form canyons, like the Grand Canyon, and waterfalls, like Niagara Falls.

Major US Rivers (in order by length)

River Name	Length	Flows Into
1. Missouri	2,540 miles	Mississippi River
2. Mississippi	2,340 miles	Gulf of Mexico
3. Yukon	1,980 miles	Bering Sea
4. Rio Grande	1,900 miles	Gulf of Mexico
4. St. Lawrence	1,900 miles	Gulf of St. Lawrence
6. Arkansas	1,460 miles	Mississippi River
7. Colorado	1,450 miles	Gulf of California
8. Red	1,290 miles	Mississippi River
9. Brazos	1,280 miles	Gulf of Mexico
10. Columbia	1,240 miles	Pacific Ocean
11. Snake	1,040 miles	Columbia River
12. Platte	990 miles	Missouri River
13. Ohio	981 miles	Mississippi River
14. Pecos	926 miles	Gulf of Mexico
15. Canadian	906 miles	Arkansas River
16. Tennessee	886 miles	Ohio River
17. Colorado	862 miles	Matagordo Bay
18. North Canadian	800 miles	Canadian River
19. Mobile	774 miles	Gulf of Mexico
20. Kansas	743 miles	Missouri River
21. Kuskokwim	724 miles	Bering Sea
22. Green	730 miles	Colorado River
23. James	710 miles	Missouri River
24. Yellowstone	692 miles	Missouri River
25. Tanana	659 miles	Yukon River
26. Gila	630 miles	Colorado River
27. Milk	625 miles	Missouri River
28. Quachita	605 miles	Red River