What is the cleanest part of the Mississippi river?
St. Paul — The Mississippi River remains a healthy, clean stream for much of the way down to about St. Cloud, the river's most pristine stretch on its 2,320-mile journey to the Gulf of Mexico.
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Stretches of the Mississippi River within the park corridor exceed water quality standards for mercury, bacteria, sediment, PCBs (polychlorinated biphenyl), and nutrients. Unfortunately, these impairments can make the water unsuitable for fishing, swimming, and drinking.
The Mississippi River and its tributaries carry excessively high levels of nutrients that cause a biological dead zone to form at the river mouth in the Gulf of Mexico. This dead zone is referred to as hypoxia, which means very low oxygen in the water.
Many popular kinds of fish including bass, bream, crappie, freshwater drum, and small catfish (less that22 inches in length) are SAFE to eat. Farm-raised catfish are SAFE to eat.
Between where the Missouri River joins the Mississippi at Saint Louis, Missouri, and Cairo, Illinois, the depth averages 30 feet (9 m). Below Cairo, where the Ohio River joins, the depth averages 50–100 feet (15–30 m) deep. The deepest part of the river is in New Orleans, where it reaches 200 feet (61 m) deep.
The Mississippi River is one of the world's major river systems in size, habitat diversity and biological productivity. It is also one of the world's most important commercial waterways and one of North America's great migration routes for both birds and fishes.
Researchers have documented at least two bull shark sightings in the Mississippi River. Female bull sharks can reach up to 11 feet long and weigh 500 pounds.
Bull sharks are euryhaline and can thrive in both salt and fresh water. They are known to travel far up rivers, and have been known to travel up the Mississippi River as far as Alton, Illinois, about 1,100 kilometres (700 mi) from the ocean, but few freshwater interactions with humans have been recorded.
The natural deepest hole in the entire Mississippi Drainage is off Algier's Point (opposite Jackson Square), where it dives to 250 feet deep. Most Rivergator sections are at least 90% wilderness and no more than 10% industry.