Three Major Rivers of the Central United States

The central U.S. is defined by three colossal river systems:

1. Mississippi River

• Length: 2,340 mi (3,766 km) from Lake Itasca, MN to Gulf of Mexico
• Basin: 1.2M mi² (3.1M km²) — 31 US states + 2 Canadian provinces
• Role: Primary commercial artery; water supply for 20M+ people

2. Missouri River

• Length: 2,500 mi (4,023 km) — longest tributary in N. America
• Source: Rocky Mountains, MT → confluence at St. Louis, MO
• Basin: 500,000 mi² — 10 states + 2 provinces
• Role: Major tributary; hydropower (6 mainstem dams); irrigation

3. Ohio River

• Length: 981 mi (1,579 km) — Pittsburgh, PA (Allegheny+Monongahela) → Cairo, IL (meets Mississippi)
• Basin: 200,000 mi² — 14 states
• Role: Largest tributary by volume; historic gateway to West; heavy industrial corridor

Together, they drain ~40% of the contiguous U.S., forming the backbone of inland navigation, agriculture, and municipal water.