River Facts [Except where noted, all data are taken from the National Park Services document entitled General Information about the Mississippi River and from the video produced by the St. Paul, Minnesota Port Authority entitled Mississippi - the Working River.] Speed At the headwaters of the Mississippi, the average surface speed of the water is near 1.2 miles per hour—roughly one-third as fast as people walk. At New Orleans the speed of the river is about 3 miles per hour. A raindrop falling in Lake Itasca would arrive at the Gulf of Mexico in about 90 days. Length River length is a difficult measurement to pin down because the river channel is constantly changing. For example, staff at Itasca State Park, the Mississippis headwaters, say the Mississippi is 2,552 miles long. The US Geologic Survey has published a number of 2,300 miles (3,705 kilometers), the EPA says it is 2,320 miles long, and the Mississippi National River and Recreation Area maintains its length at 2,350 miles (or about 4,100 kilometers). Width At Lake Itasca, the river is between 20 and 30 feet wide. The Mississippi is widest just downstream from its confluence with the Missouri River (near Alton, Il.) where it is nearly 1 mile across. [Note: In the first mile of the river, just out from Lake Itasca, there were places where I could touch both banks of the river with my canoe paddle, certainly less than 20 feet in width -- G.H.] Depth At its headwaters, the Mississippi is less than 3 feet deep. The rivers deepest section is between Governor Nicholls Wharf and Algiers Point in New Orleans where it is 200 feet deep. Volume At Lake Itasca, the average flow rate is 6 cubic feet per second. At Upper St. Anthonys Falls, the northernmost Lock and Dam, the average flow rate is 12,000 cubic ft/second. At New Orleans, the average flow rate is 600,000 cubic feet per second. There are 7.489 gallons of water in a cubic foot. One cubic foot of water weighs 65.4 pounds. A 48 foot semi-truck trailer is a 3,600 cu. ft. container. At Itasca, it would take 10 minutes for one semi-trailer of water to flow out of the lake into the Mississippi. At St. Anthony Falls, the equivalent of 3 semi-trailers full of water go over the falls every second. At New Orleans, the equivalent of 166 semi-trailers of water flow past Algiers Point each second. Elevation The elevation of the Mississippi at Lake Itasca is 1,475 feet above sea level. It drops to 0 feet above sea level at the Gulf of Mexico. More than half of that drop in elevation occurs within the state of Minnesota. Sediment Load The Mississippi carries an average of 436,000 tons of sediment each day. Over the course of a year, it moves an average of 159 million tons of sediment. Averages have ranged from 1,576,000 tons per day in 1951 to 219,000 in 1988. Watershed Area The Mississippi River Basin or Watershed drains 41% of continental United States. Thirty-one states and two Canadian provinces are included in the watershed. The total area drained by the watershed is between 1.2 and 1.8 million square miles. Water Supply Communities up and down the river use the Mississippi to obtain fresh water and to discharge their industrial and municipal waste. We dont have good figures on water use for the whole Mississippi River Basin, but we have some clues. A January, 2000 study published by the Upper Mississippi River Conservation Committee states that close to15 million people rely on the Mississippi River or its tributaries in just the upper half of the basin (from Cairo, IL to Minneapolis, MN). A frequently cited figure of 18 million people using the Mississippi River Watershed for water supply comes from a 1982 study by the Upper Mississippi River Basin Committee. The Environmental Protection Agency simply says that more than 50 cities rely on the Mississippi for daily water supply. Locks and Dams There are 29 total between Minneapolis and St. Louis. The lower 27 are numbered, with Lock and Dam Number One by the Ford Bridge between Minneapolis and Saint Paul. Two more were belatedly added in the 1960s in Downtown Minneapolis. Since One was already assigned, these two became the Upper and Lower St. Anthony Falls Locks and Dams. The majority of locks are 100 feet wide, wide enough for double-wide barges. Only the three upper most locks in Minneapolis and St. Paul are 56 feet wide, room enough only for single-wides. The need to break down double wide barges is costly and time-consuming. Commerce For nearly 200 years agriculture has been the primary user of the basin lands, continually altering the hydrologic cycle and energy budget of the region. The value of the agricultural products and the huge agribusiness industry that has developed in the basin produces 92% of the nations agricultural exports, 78% of the worlds exports in feed grains and soybeans, and most of the livestock and hogs produced nationally. Sixty percent of all grain exported from the US is shipped via the Mississippi River through the Port of New Orleans and the Port of South Louisiana. In measure of tonnage, the largest port in the world is located on the Mississippi River at LaPlace, Louisiana. Between the two of them, the Ports of New Orleans and South Louisiana shipped more than 243 milliions tons of goods in 1999. Shipping at the lower end of the Mississippi is focused on petroleum, iron and steel, grain, rubber, paper and wood, coffee, coal, chemicals, and edible oils. Wildlife The Mississippi River and its floodplain are home to a diverse population of living things: At least 260 species of fishes, 25% of all fish species in North America Forty percent of the nations migratory waterfowl use the river corridor during their Spring and Fall migration Sixty percent of all North American birds (326 species) use the Mississippi River Basin as their migratory flyway From Cairo, IL, upstream to Lake Itasca, there are 38 documented species of mussel. On the Lower Mississippi, there may be as many as 60 separate species of mussels The Upper Mississippi is host to more than 50 species of mammals; At least 145 species of amphibians and reptiles inhabit the Upper Mississippi River environs. River Traffic To move goods up and down the Mississippi, the U.S. Army Corps of Engineers maintains a 9-foot shipping channel from Baton Rouge, LA to Minneapolis, MN. From Baton Rouge past New Orleans to Head of Passes, a 45-foot channel is maintained to allow ocean-going vessels access to ports as far upstream as Baton Rouge. Towboat Statistics On one gallon of fuel, 1 ton of cargo can be moved 60 miles by truck, 202 miles by rail, and 514 miles by barge. One barge holds as much as 15 jumbo rail hoppers and 58 semi truck trailers. One bargeload of wheat is enough to bake 2.25 million loaves of bread. M
Posted on: Thu, 13 Feb 2014 18:13:01 +0000
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