By Madeline Heim, Milwaukee Journal Sentinel

The Mississippi River flows through 2,350 miles of America’s heartland to the Gulf of Mexico. It provides habitat for hundreds of fish and wildlife species, charts the course of millions of tons of goods exported from the U.S. and has a rich cultural history, featured in many beloved books and songs.

It’s facing big environmental challenges: nitrate and phosphorus pollution, forest loss, invasive species and prolonged and excessive flooding, to name a few. But it could also provide nature-based solutions to some of those problems, as scientists, politicians and citizens learn more about what can be done to protect it.

Here are 10 things to know about the iconic river that forms the nation’s largest watershed, spanning 31 states from Minnesota to Louisiana and Montana to Pennsylvania.

Where does the Mississippi River start and finish?

The Mississippi River begins as a small, knee-deep river flowing out of Lake Itasca in northwestern Minnesota. At just 18 feet wide, it’s easy to walk across.

It flows hundreds of miles across Minnesota, including through the Twin Cities, before it reaches the Wisconsin border. Then it heads south, running alongside major cities like St. Louis, Memphis and New Orleans.

The river ends about 100 miles downstream from New Orleans, where it empties into the Gulf of Mexico. It takes 90 days for a single drop of water to travel from the headwaters to the Gulf.

What are the Mississippi River tributaries?

Some of the biggest tributaries that flow into the Mississippi include the Illinois, Missouri, Ohio, Arkansas and Red rivers.

How big is the Mississippi River basin?

The Mississippi River basin drains more than 40% of the continental U.S. In other words, any drop of rain or snow that falls across a large part of the country ends up in the Mississippi. It includes 31 states — some fully and some partially — and two Canadian provinces.

Because water travels over so much land before it reaches the Mississippi River, land use is an important determinant of the river’s health. Industry and agriculture have both played a role in polluting the river, resulting in what’s known as the Dead Zone in the Gulf of Mexico — a massive area where nutrient pollution chokes off oxygen for fish and plants.

Is the Mississippi River the longest river in the United States?

No. The Mississippi River flows about 2,350 miles, according to the National Park Service. The Missouri River flows about 100 miles longer, making it America’s longest river.

The Missouri River stretches from the Rocky Mountains in southwest Montana to St. Louis, where it meets the Mississippi.

Both rivers’ lengths can change slightly as their deltas grow or shrink from sedimentation or erosion. The Mississippi River delta in particular has lost approximately 70% of its land area since 1932 due to coastal erosion, sea level rise and human activities like oil and gas extraction.

Is the Mississippi River one of the longest rivers in the world? How does it compare to the Amazon and Nile?

Most lists of the world’s longest rivers combine the Missouri and the Mississippi, since they join up. By that measure, the river is the fourth-longest in the world, behind the Nile, the Amazon and the Yangtze rivers.

By volume, the Mississippi River is the 15th-largest in the world. It discharges close to 600,000 cubic feet of water per second into the Gulf of Mexico, according to the National Park Service.

Where is the Mississippi River deepest?

The river’s deepest point is near Algiers Point in New Orleans, measuring about 200 feet deep. That’s a far cry from its depth at the headwaters, which is about 18 inches, according to the Minnesota Department of Natural Resources.

Do people drink from the Mississippi River?

Yes. The river provides drinking water for almost 20 million people in more than 50 municipalities, according to the environmental advocacy group American Rivers.

What cargo does it transport? Is the Mississippi River drying out?

The Mississippi River is a major player in worldwide shipping and commerce. It carries around 500 million short tons per year of goods, including corn, soy, fertilizer, road salt, coal and petroleum products.

More than 90% of the nation’s agricultural exports are grown in the Mississippi River basin; 60% of all grain exported from the U.S. is shipped on the river.

Periods of drought or flooding — which are expected to get more frequent as the climate changes — can stall shipping on the river. For example, near-record low water levels caused by drought caused barges to run aground on the lower Mississippi in fall 2022.

Is the Mississippi River important for wildlife?

The river ecosystem is vital for a wide variety of birds, fish and other animals. Each year, it provides a place to rest, breed and eat for more than 325 species of migrating birds. The upper Mississippi alone is home to over 119 species of fish, and its surrounding backwaters, wetlands and forests provide habitat for a multitude of other animals as well.

These important habitats are threatened by climate change and human activities. For example, prolonged and frequent flooding on the upper Mississippi caused by more precipitation and land use changes in the basin is killing floodplain forests and disturbing habitat for fish.

How did the Mississippi River get its name?

“Mississippi” comes from the French interpretation of the Ojibwe name for the river. That name was Misi-Ziibi, which means “great river.”

The river is known by a variety of nicknames too, such as the Father of Waters.

This story is a product of the Mississippi River Basin Ag & Water Desk, an independent reporting network based at the University of Missouri in partnership with Report for America, with major funding from the Walton Family Foundation. Sign up to republish stories like this one for free.

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