What are the 10 largest watersheds in US?

1. Missouri River Watershed:

Area: 529,000 sq mi (1.37 million sq km)

States: Montana, North Dakota, South Dakota, Nebraska, Kansas, Missouri, Oklahoma, Iowa, Minnesota

2. Mississippi River Watershed:

Area: 373,000 sq mi (965,000 sq km)

States: Minnesota, Wisconsin, Iowa, Illinois, Missouri, Arkansas, Tennessee, Kentucky, Mississippi, Louisiana

3. Columbia River Watershed:

Area: 259,000 sq mi (671,000 sq km)

States: Washington, Oregon, Idaho, Montana, Wyoming, Nevada

4. Rio Grande Watershed:

Area: 189,000 sq mi (489,000 sq km)

States: Colorado, New Mexico, Texas

5. Ohio River Watershed:

Area: 203,600 sq mi (527,000 sq km)

States: Pennsylvania, Ohio, Indiana, Illinois, West Virginia, Kentucky, Tennessee

6. Yukon River Watershed:

Area: 221,000 sq mi (572,000 sq km)

States: Alaska, Canada (Yukon Territory, British Columbia)

7. Colorado River Watershed:

Area: 178,000 sq mi (461,000 sq km)

States: Colorado, Utah, Arizona, New Mexico, Nevada, California, Wyoming, Mexico

8. Snake River Watershed:

Area: 108,000 sq mi (279,600 sq km)

States: Wyoming, Idaho, Oregon, Washington, Nevada, Utah

9. Susquehanna River Watershed:

Area: 27,500 sq mi (71,200 sq km)

States: New York, Pennsylvania, Maryland

10. Arkansas River Watershed:

Area: 172,000 sq mi (445,000 sq km)

States: Colorado, Kansas, Oklahoma, Arkansas