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97-655: The peak is the highest mountain in the United States east of the Mississippi River , and the highest in all of eastern North America south of the Arctic Cordillera . The nearest higher peaks are in the Black Hills of South Dakota and the highland foothills of Colorado . The mountain's topographic isolation is calculated from the nearest discernible single higher point: Lone Butte , which

194-622: A Csa climate well inland to ensure hot summers and cold winters. They are generally found in the highly elevated areas of south-eastern Turkey ( Hakkâri ), north-western Iran, northern Iraq, parts of Central Asia , parts of the High Atlas mountain range in central Morocco and very small parts of the Intermountain West in the United States. This climate zone does not exist at all in the Southern Hemisphere, where

291-614: A classification). More extreme and inland humid continental climates, sometimes known as "hyper-continental" climates, are found in northeast China , southern Siberia , Mongolia , Kazakhstan , most of the southern interior of Canada , and the Upper Midwest , where temperatures in the winter resemble those of adjacent subarctic climates (with long, drier, generally very cold winters) but have longer and generally warmer summers (in occasional cases, hot summers). A more moderate variety, found in places like Honshu , east-central China,

388-542: A large mound of sand spanning the width of the river 55 feet below the surface, allowing fresh water and large cargo ships to pass over. Fresh river water flowing from the Mississippi into the Gulf of Mexico does not mix into the salt water immediately. The images from NASA 's MODIS show a large plume of fresh water, which appears as a dark ribbon against the lighter-blue surrounding waters. These images demonstrate that

485-734: A length of 3,710 miles (5,971 km), making it the fourth longest river in the world after the Nile , Amazon , and Yangtze . When measured by the largest stream source (by water volume), the Ohio River , by extension the Allegheny River , would be the source, and the Mississippi would begin in Pennsylvania . At its source at Lake Itasca , the Mississippi River is about 3 feet (0.91 m) deep. The average depth of

582-516: A marked reduction in wintry precipitation, which increases the chances of a wintertime drought ( w ). Snowfall occurs in all areas with a humid continental climate and in many such places is more common than rain during the height of winter. In places with sufficient wintertime precipitation, the snow cover is often deep. Most summer rainfall occurs during thunderstorms , and in North America and Asia an occasional tropical cyclone (or

679-478: A natural process known as avulsion or delta switching, the lower Mississippi River has shifted its final course to the mouth of the Gulf of Mexico every thousand years or so. This occurs because the deposits of silt and sediment begin to clog its channel, raising the river's level and causing it to eventually find a steeper, more direct route to the Gulf of Mexico. The abandoned distributaries diminish in volume and form what are known as bayous . This process has, over

776-569: A parking lot where a steep paved 980-foot (300 m) trail leads through a conifer forest to the summit. The 40-foot (12 m) stone observation tower on the summit was torn down in late 2006. A new observation deck was constructed and opened to visitors in January 2009. Mount Mitchell was formed during the Precambrian when marine deposits were metamorphosed into gneiss and schist . These metasedimentary rocks were later uplifted during

873-739: A subarctic climate. In the Southern Hemisphere , it exists in well-defined areas only in the Southern Alps of New Zealand , in the Snowy Mountains of Australia in Kiandra, New South Wales and the Andes Mountains of Argentina and Chile . Since climate regimes tend to be dominated by vegetation of one region with relatively homogenous ecology, those that project climate change remap their results in

970-526: A thermal profile, but because of semi-arid precipitation portions of it are grouped into the BSk category. In Europe , it is found in much of Central Europe : Germany (in the east and southeast part of the country), Austria (generally below 700 m (2,297 ft)), Poland , Czech Republic , Slovakia , Hungary (generally above 100 m (328 ft)), Croatia (mostly Slavonia region), in much of Eastern Europe : Ukraine (the whole country except

1067-589: Is 1,189 miles (1,913 km) away in southeastern Colorado. Mount Mitchell was the highest mountain of the United States from 1789 until the Louisiana Purchase in 1803 when Mount Elbert became the highest mountain claimed by the United States. Mount Mitchell was also the most isolated peak in the United States from 1789 until the Treaty of Guadalupe Hidalgo in 1848 when Mount Whitney became

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1164-794: Is 208,200 cu ft/s (5,900 m /s). Thus, by volume, the main branch of the Mississippi River system at Cairo can be considered to be the Ohio River (and the Allegheny River further upstream), rather than the Middle Mississippi. In addition to the Ohio River , the major tributaries of the Lower Mississippi River are the White River , flowing in at the White River National Wildlife Refuge in east-central Arkansas;

1261-575: Is a meandering river in a broad, flat area, only rarely flowing alongside a bluff (as at Vicksburg, Mississippi ). The Mississippi River is known as the Middle Mississippi from the Upper Mississippi River's confluence with the Missouri River at St. Louis, Missouri , for 190 miles (310 km) to its confluence with the Ohio River at Cairo, Illinois . The Middle Mississippi is relatively free-flowing. From St. Louis to

1358-498: Is called the Lower Mississippi River from its confluence with the Ohio River to its mouth at the Gulf of Mexico, a distance of about 1,000 miles (1,600 km). At the confluence of the Ohio and the Middle Mississippi, the long-term mean discharge of the Ohio at Cairo, Illinois is 281,500 cubic feet per second (7,970 cubic meters per second), while the long-term mean discharge of the Mississippi at Thebes, Illinois (just upriver from Cairo)

1455-912: Is controlled and managed as a series of pools created by 26 locks and dams. The Upper Mississippi River is joined by the Minnesota River at Fort Snelling in the Twin Cities ; the St. Croix River near Prescott, Wisconsin ; the Cannon River near Red Wing, Minnesota ; the Zumbro River at Wabasha, Minnesota ; the Black , La Crosse , and Root rivers in La Crosse, Wisconsin ; the Wisconsin River at Prairie du Chien, Wisconsin ;

1552-521: Is found in northern Kazakhstan , southern Siberia , parts of Mongolia , northern China , and highland elevations in the Koreas . Like its hot-summer counterpart, these climates are typically dry in the winter and bitterly cold due to the Siberian High (often with winter temperatures comparable to their nearby subarctic climates ), while summers are warm and long enough to avoid classification as

1649-520: Is largely a multi-thread stream with many bars and islands. From its confluence with the St. Croix River downstream to Dubuque, Iowa , the river is entrenched, with high bedrock bluffs lying on either side. The height of these bluffs decreases to the south of Dubuque, though they are still significant through Savanna, Illinois . This topography contrasts strongly with the Lower Mississippi, which

1746-467: Is less extreme than the most inland hyper-continental variety. Using the Köppen climate classification , a climate is classified as humid continental when the temperature of the coldest month is below 0 °C [32.0 °F] or −3 °C [26.6 °F] and there must be at least four months whose mean temperatures are at or above 10 °C (50 °F). These temperatures were not arbitrary. In Europe,

1843-565: Is less seasonally uniform in the west. The western states of the western United States (namely Montana , Wyoming , parts of southern Idaho , most of Lincoln County in Eastern Washington , parts of Colorado , parts of Utah , isolated parts of northern New Mexico , western Nebraska , and parts of western North and South Dakota ) have thermal regimes which fit the Dfa climate type, but are quite dry, and are generally grouped with

1940-404: Is not a factor used in defining the humid continental climate, snow during the winter in this type of climate is almost a guarantee, either intermittently throughout the winter months near the poleward or coastal margins, or persistently throughout the winter months elsewhere in the climate zone. Humid continental climates are generally found between latitudes 40° N and 60° N , within

2037-724: Is noted during the autumn of deciduous forests. In the poleward direction, these climates transition into subarctic climates featuring short summers (and usually very cold winters) allowing only conifer trees. Moving equatorword, the hot-summer continental climates grade into humid subtropical climates (chiefly in North America and Asia) while the warm-summer continental climates grade into oceanic climates (chiefly in Europe), both of which have milder winters where average temperatures stay above 0°C (or -3°C). Some continental climates with lower precipitation (chiefly in Central Asia and

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2134-537: Is often windy, with recorded gusts of up to 178 mph (286 km/h). Mount Mitchell recorded a new state record of 139.94 inches (3,554.5 mm) of precipitation in 2018, which is also the highest total rainfall recorded during a calendar year anywhere east of the Cascade Range in the Contiguous United States .   Mississippi River The Mississippi River is

2231-539: Is the only true waterfall on the entire Mississippi River. The water elevation continues to drop steeply as it passes through the gorge carved by the waterfall. After the completion of the St. Anthony Falls Lock and Dam in 1963, the river's head of navigation moved upstream, to the Coon Rapids Dam . However, the Locks were closed in 2015 to control the spread of invasive Asian carp , making Minneapolis once again

2328-701: Is to be found in northern China including Manchuria and parts of North China , south-east Russia , and over much of the Korean Peninsula ; it has the Köppen classification Dwa . Much of central Asia , northwestern China , and southern Mongolia has a thermal regime similar to that of the Dfa climate type, but these regions receive so little precipitation that they are more often classified as steppes ( BSk ) or deserts ( BWk ). Dsa climates are rare; they are generally restricted to elevated areas adjacent to mid-latitude Mediterranean climate regions with

2425-533: The Alleghenian orogeny . The soils are well drained, dark brown and stony with fine-earth material ranging in texture from sandy clay loam to loam or sandy loam; Burton and Craggey are the most common series around the summit. The mountain's summit is coated in a dense stand of Southern Appalachian spruce-fir forest , which consists primarily of two evergreen species—the red spruce and the Fraser fir . Most of

2522-618: The American Civil War , the Mississippi's capture by Union forces marked a turning point towards victory , due to the river's strategic importance to the Confederate war effort. Because of the substantial growth of cities and the larger ships and barges that replaced steamboats, the first decades of the 20th century saw the construction of massive engineering works such as levees , locks and dams , often built in combination. A major focus of this work has been to prevent

2619-880: The Arkansas River , joining the Mississippi at Arkansas Post ; the Big Black River in Mississippi; and the Yazoo River , meeting the Mississippi at Vicksburg, Mississippi . Deliberate water diversion at the Old River Control Structure in Louisiana allows the Atchafalaya River in Louisiana to be a major distributary of the Mississippi River, with 30% of the combined flow of the Mississippi and Red Rivers flowing to

2716-698: The Black Sea coast), Belarus , Russia (mostly central part of European Russia ), south and central parts of the Nordic countries not bathed by the Atlantic Ocean or North Sea : Sweden (historical regions of Svealand and Götaland ), Denmark , Finland (south end, including the three largest cities ), Norway (most populated area), all Baltic States : Estonia , Latvia , Lithuania and also in parts of: Romania (generally above 100 m (328 ft)), Bosnia and Herzegovina , Turkey and in

2813-482: The Cairngorm Mountains of Scotland , (generally above 100 m (328 ft)). It has little warming or precipitation effects from the northern Atlantic. The cool summer subtype is marked by mild summers, long cold winters and less precipitation than the hot summer subtype; however, short periods of extreme heat are not uncommon. Northern Japan has a similar climate. In Asia, this climate type

2910-484: The Dfa climate type is present near the Black Sea in southern Ukraine , the Southern Federal District of Russia , southern Moldova , Serbia , parts of southern Romania , and Bulgaria , but tends to be drier and can be even semi-arid in these places. In East Asia, this climate exhibits a monsoonal tendency with much higher precipitation in summer than in winter, and due to the effects of

3007-577: The Gulf of Mexico , part of the Atlantic Ocean. The total catchment of the Mississippi River covers nearly 40% of the landmass of the continental United States. The highest point within the watershed is also the highest point of the Rocky Mountains , Mount Elbert at 14,440 feet (4,400 m). In the United States, the Mississippi River drains the majority of the area between the crest of

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3104-538: The Korean Peninsula , parts of Eastern Europe , parts of southern Ontario , much of the American Midwest , and the Northeast US , the climate combines hotter summer maxima and greater humidity (similar to those found in adjacent humid subtropical climates ) and moderately cold winters and more intermittent snow cover (averaging somewhat below freezing, too cold for a more temperate classification), and

3201-603: The Minnesota River , James River , and Milk River valleys. When the ice sheet completely retreated, many of these "temporary" rivers found paths to Hudson Bay or the Arctic Ocean, leaving the Mississippi Basin with many features "over-sized" for the existing rivers to have carved in the same time period. Ice sheets during the Illinoian Stage , about 300,000 to 132,000 years before present, blocked

3298-1320: The Rock River at the Quad Cities ; the Iowa River near Wapello, Iowa ; the Skunk River south of Burlington, Iowa ; and the Des Moines River at Keokuk, Iowa . Other major tributaries of the Upper Mississippi include the Crow River in Minnesota, the Chippewa River in Wisconsin, the Maquoketa River and the Wapsipinicon River in Iowa, and the Illinois River in Illinois. The Upper Mississippi

3395-887: The Rocky Mountains and the crest of the Appalachian Mountains , except for various regions drained to Hudson Bay by the Red River of the North ; to the Atlantic Ocean by the Great Lakes and the Saint Lawrence River ; and to the Gulf of Mexico by the Rio Grande , the Alabama and Tombigbee rivers, the Chattahoochee and Appalachicola rivers, and various smaller coastal waterways along

3492-429: The headwaters region and serve multiple purposes, including power generation and recreation. The remaining 29 dams, beginning in downtown Minneapolis, all contain locks and were constructed to improve commercial navigation of the upper river. Taken as a whole, these 43 dams significantly shape the geography and influence the ecology of the upper river. Beginning just below Saint Paul, Minnesota , and continuing throughout

3589-422: The most recent Ice Age . The southernmost extent of this enormous glaciation extended well into the present-day United States and Mississippi basin. When the ice sheet began to recede, hundreds of feet of rich sediment were deposited, creating the flat and fertile landscape of the Mississippi Valley. During the melt, giant glacial rivers found drainage paths into the Mississippi watershed, creating such features as

3686-483: The primary river of the largest drainage basin in the United States . From its traditional source of Lake Itasca in northern Minnesota , it flows generally south for 2,340 miles (3,766 km) to the Mississippi River Delta in the Gulf of Mexico . With its many tributaries , the Mississippi's watershed drains all or parts of 32 U.S. states and two Canadian provinces between the Rocky and Appalachian mountains. The river either borders or passes through

3783-447: The southeastern U.S. The monthly daily average temperature ranges from 25.1 °F (−3.8 °C) in January to 59.6 °F (15.3 °C) in July. The coldest temperature ever recorded in the state occurred there on January 21, 1985, when it fell to −34 °F (−36.7 °C), during a severe cold spell . It is also the coldest average reporting station in the state at 42.9 °F (6.1 °C), well below any other station. Unlike

3880-415: The Canadian Prairie Provinces and below 40°N in the high Appalachians . In Europe, this subtype reaches its most northerly latitude in Bodø at the 67°N . High-altitude locations such as Flagstaff, Arizona , Aspen, Colorado and Los Alamos, New Mexico in the western United States exhibit local Dfb climates. The south-central and southwestern Prairie Provinces also fits the Dfb criteria from

3977-402: The Earth's mantle (specifically, the Bermuda hotspot ) that was undergoing a period of intense activity. The upwelling of magma from the hotspot forced the further uplift to a height of perhaps 2–3 km of part of the Appalachian-Ouachita range, forming an arch that blocked southbound water flows. The uplifted land quickly eroded and, as North America moved away from the hot spot and as

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4074-400: The French rendering of the Anishinaabe ( Ojibwe or Algonquin ) name for the river, Misi-ziibi (Great River). In the 18th century, the river was set by the Treaty of Paris as, for the most part, the western border of the new United States. With the Louisiana Purchase and the country's westward expansion, it became a convenient boundary line between the western and eastern halves of

4171-588: The Gulf of Mexico by this route, rather than continuing down the Mississippi's current channel past Baton Rouge and New Orleans on a longer route to the Gulf. Although the Red River was once an additional tributary, its water now flows separately into the Gulf of Mexico through the Atchafalaya River. The Mississippi River has the world's fourth-largest drainage basin ("watershed" or "catchment"). The basin covers more than 1,245,000 square miles (3,220,000 km ), including all or parts of 32 U.S. states and two Canadian provinces. The drainage basin empties into

4268-409: The Gulf. The Mississippi River empties into the Gulf of Mexico about 100 miles (160 km) downstream from New Orleans. Measurements of the length of the Mississippi from Lake Itasca to the Gulf of Mexico vary somewhat, but the United States Geological Survey 's number is 2,340 miles (3,766 km). The retention time from Lake Itasca to the Gulf is typically about 90 days; while speed varies along

4365-404: The Illinoian Stage. Timeline of outflow course changes In March 1876, the Mississippi suddenly changed course near the settlement of Reverie, Tennessee , leaving a small part of Tipton County, Tennessee , attached to Arkansas and separated from the rest of Tennessee by the new river channel. Since this event was an avulsion , rather than the effect of incremental erosion and deposition,

4462-408: The Midwestern and eastern U.S. These earthquakes created Reelfoot Lake in Tennessee from the altered landscape near the river. When measured from its traditional source at Lake Itasca , the Mississippi has a length of 2,340 miles (3,766 km). When measured from its longest stream source (most distant source from the sea), Brower's Spring in Montana , the source of the Missouri River , it has

4559-416: The Mississippi River between Saint Paul and Saint Louis is between 9 and 12 feet (2.7–3.7 m) deep, the deepest part being Lake Pepin , which averages 20–32 feet (6–10 m) deep and has a maximum depth of 60 feet (18 m). 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,

4656-411: The Mississippi River has experienced numerous large and small changes to its main course, as well as additions, deletions, and other changes among its numerous tributaries, and the lower Mississippi River has used different pathways as its main channel to the Gulf of Mexico across the delta region. As Pangaea began to break up about 95 million years ago, North America passed over a volcanic " hotspot " in

4753-415: The Mississippi River near New Madrid, Missouri , between Memphis and St. Louis, is related to an aulacogen (failed rift) that formed at the same time as the Gulf of Mexico. This area is still quite active seismically. Four great earthquakes in 1811 and 1812 , estimated at 8 on the Richter magnitude scale , had tremendous local effects in the then sparsely settled area, and were felt in many other places in

4850-427: The Mississippi River. Humid continental climate A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers, and cold (sometimes severely cold in the northern areas) and snowy winters. Precipitation is usually distributed throughout

4947-404: The Mississippi near Rock Island, Illinois, diverting it to its present channel farther to the west, the current western border of Illinois. The Hennepin Canal roughly follows the ancient channel of the Mississippi downstream from Rock Island to Hennepin, Illinois . South of Hennepin, to Alton, Illinois , the current Illinois River follows the ancient channel used by the Mississippi River before

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5044-529: The Missouri River; the Middle Mississippi, which is downriver from the Missouri to the Ohio River; and the Lower Mississippi , which flows from the Ohio to the Gulf of Mexico. The Upper Mississippi runs from its headwaters to its confluence with the Missouri River at St. Louis, Missouri. It is divided into two sections: The source of the Upper Mississippi branch is traditionally accepted as Lake Itasca , 1,475 feet (450 m) above sea level in Itasca State Park in Clearwater County, Minnesota . The name Itasca

5141-443: The Ohio River confluence, the Middle Mississippi falls 220 feet (67 m) over 180 miles (290 km) for an average rate of 1.2 feet per mile (23 cm/km). At its confluence with the Ohio River, the Middle Mississippi is 315 feet (96 m) above sea level. Apart from the Missouri and Meramec rivers of Missouri and the Kaskaskia River of Illinois, no major tributaries enter the Middle Mississippi River. The Mississippi River

5238-430: The Upper Mississippi River is the Upper St. Anthony Falls Lock and Dam in Minneapolis. Above the dam, the river's elevation is 799 feet (244 m). Below the dam, the river's elevation is 750 feet (230 m). This 49-foot (15 m) drop is the largest of all the Mississippi River locks and dams. The origin of the dramatic drop is a waterfall preserved adjacent to the lock under an apron of concrete. Saint Anthony Falls

5335-426: The Upper Mississippi is a simple steel culvert, through which the river (locally named "Nicolet Creek") flows north from Lake Nicolet under "Wilderness Road" to the West Arm of Lake Itasca, within Itasca State Park . The earliest bridge across the Mississippi River was built in 1855. It spanned the river in Minneapolis where the current Hennepin Avenue Bridge is located. No highway or railroad tunnels cross under

5432-403: The Western United States) grade into semi-arid climates with similar temperatures but low precipitation. A hot summer version of a continental climate features an average temperature of at least 22 °C (71.6 °F) in its warmest month. Since these regimes are restricted to the Northern Hemisphere, the warmest month is usually July or August. High temperatures during the warmest month tend to be in

5529-555: The areas drained by them. Denser salt water from the Gulf of Mexico forms a salt wedge along the river bottom near the mouth of the river, while fresh water flows near the surface. In drought years, with less fresh water to push it out, salt water can travel many miles upstream—64 miles (103 km) in 2022—contaminating drinking water supplies and requiring the use of desalination . The United States Army Corps of Engineers constructed "saltwater sills" or "underwater levees" to contain this in 1988, 1999, 2012, and 2022. This consists of

5626-415: The basin in increasing numbers. The river served sometimes as a barrier, forming borders for New Spain , New France , and the early United States, and throughout as a vital transportation artery and communications link. In the 19th century, during the height of the ideology of manifest destiny , the Mississippi and several tributaries, most notably its largest, the Ohio and Missouri , formed pathways for

5723-420: The central and northeastern portions of North America , Europe , and Asia . Occasionally, they can also be found at higher elevations above other more temperate climate types. They are rare in the Southern Hemisphere , limited to isolated high altitude locations, due to the larger ocean area at that latitude, smaller land mass, and the consequent greater maritime moderation. In the Northern Hemisphere, some of

5820-400: The classification symbol defines seasonal rainfall as follows: while the third letter denotes the extent of summer heat: Within North America, moisture within this climate regime is supplied by the Great Lakes , Gulf of Mexico and adjacent western subtropical Atlantic . Precipitation is relatively well distributed year-round in many areas with this climate ( f ), while others may see

5917-425: The continents either do not penetrate low enough in latitude or taper too much to have any place that gets the combination of snowy winters and hot summers. Marine influences are very strong around 40°S and such preclude Dfa , Dwa , and Dsa climates from existing in the southern hemisphere. Also known as hemiboreal climate , areas featuring this subtype of the continental climate have an average temperature in

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6014-411: The country. This is reflected in the Gateway Arch in St. Louis, which was designed to symbolize the opening of the West, and the focus on the " Trans-Mississippi " region in the Trans-Mississippi Exposition . Regional landmarks are often classified in relation to the river, such as "the highest peak east of the Mississippi " or "the oldest city west of the Mississippi". The FCC also uses it as

6111-427: The course of the river, this gives an overall average of around 26 mi (42 km) per day, or 1 mi (1.6 km) per hour. The stream gradient of the entire river is 0.01%, a drop of 450 m over 3,766 km. The Mississippi River discharges at an annual average rate of between 200 and 700 thousand cubic feet per second (6,000 and 20,000 m /s). The Mississippi is the fourteenth largest river in

6208-403: The delta of the Chippewa River of Wisconsin as it enters the Upper Mississippi, is more than 2 miles (3.2 km) wide. By the time the Upper Mississippi reaches Saint Paul , Minnesota, below Lock and Dam No. 1, it has dropped more than half its original elevation and is 687 feet (209 m) above sea level. From St. Paul to St. Louis, Missouri, the river elevation falls much more slowly and

6305-532: 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 runs through or along 10 states, from Minnesota to Louisiana , and is used to define portions of these states' borders, with Wisconsin , Illinois , Kentucky , Tennessee , and Mississippi along the east side of the river, and Iowa , Missouri , and Arkansas along its west side. Substantial parts of both Minnesota and Louisiana are on either side of

6402-405: The dividing line for broadcast call-signs , which begin with W to the east and K to the west, overlapping in media markets along the river. Due to its size and importance, it has been nicknamed The Mighty Mississippi River or simply The Mighty Mississippi . The Mississippi River can be divided into three sections: the Upper Mississippi , the river from its headwaters to the confluence with

6499-409: The high 20s to low 30s °C (80s °F), while average January afternoon temperatures are near or well below freezing. Frost-free periods typically last 4 to 7 months in this climate regime. Within North America , this climate includes portions of the central and eastern United States from east of 100°W to south of about the 44°N to the Atlantic . Precipitation increases further eastward in this zone and

6596-488: The high-altitude ecosystem is debatable. While the mountain is still mostly lush and green in the summer, many dead Fraser fir trunks can be seen due to these serious problems. Reducing air pollution is a difficult issue, as the pollutants are often carried by air to this area from long distances. Sources can be local or hundreds of miles away, requiring cooperation from as far away as the Midwest . Wildflowers are abundant all summer long. Young fir and spruce trees do well in

6693-441: The hotspot's activity declined, the crust beneath the embayment region cooled, contracted and subsided to a depth of 2.6 km, and around 80 million years ago the Reelfoot Rift formed a trough that was flooded by the Gulf of Mexico . As sea levels dropped, the Mississippi and other rivers extended their courses into the embayment , which gradually became filled with sediment with the Mississippi River at its center. Through

6790-439: The humid continental climate covers a much larger area than the hot subtype. In North America, the climate zone covers from about 42°N to 50°N latitude mostly east of 100°W , including parts of Southern Ontario , the southern half of Quebec , The Maritimes , and Newfoundland , as well as the northern United States from eastern North Dakota east to Maine . However, it can be found as far north as 54°N , and further west in

6887-421: The humid continental climates, typically in around Hokkaido , Sakhalin Island , northeastern mainland Europe , Scandinavia , Nova Scotia , and Newfoundland are closer to the sea and heavily maritime-influenced and comparable to oceanic climates , with relatively cool summers, significant year-round precipitation (including high amounts of snow) and winters being just below the freezing mark (too cold for such

6984-479: The largest in North America. Native Americans have lived along the Mississippi River and its tributaries for thousands of years. Many were hunter-gatherers , but some, such as the Mound Builders , formed prolific agricultural and urban civilizations, and some practiced aquaculture . The arrival of Europeans in the 16th century changed the native way of life as first explorers, then settlers, ventured into

7081-402: The last two decades, this number was only 160 million short tons (145 million metric tons) per year. The reduction in sediment transported down the Mississippi River is the result of engineering modification of the Mississippi, Missouri, and Ohio rivers and their tributaries by dams, meander cutoffs , river-training structures, and bank revetments and soil erosion control programs in

7178-558: The lower 10 miles (16 km) of the Kaskaskia River, forming a new Mississippi channel and cutting off the town from the rest of the state. Later flooding destroyed most of the remaining town, including the original State House. Today, the remaining 2,300 acres (930 ha) island and community of 14 residents is known as an enclave of Illinois and is accessible only from the Missouri side. The New Madrid Seismic Zone , along

7275-415: The lower Mississippi from shifting into the channel of the Atchafalaya River and bypassing New Orleans . Since the 20th century, the Mississippi River has also experienced major pollution and environmental problems — most notably elevated nutrient and chemical levels from agricultural runoff, the primary contributor to the Gulf of Mexico dead zone . The word Mississippi itself comes from Misi zipi ,

7372-569: The lower elevations in the surrounding regions, heavy snows often fall from December to March, with 50 inches (1.27 m) accumulating in the Great Blizzard of 1993 and 33 inches (0.84 m) in the January 2016 blizzard . Due to the high elevation, precipitation is heavy and reliable year-round, averaging 81.09 inches (2,060 mm) for the year, with no month receiving less than 5 in (127 mm) of average precipitation. The summit

7469-450: The mature Fraser firs, however, were killed off by the non-native Balsam woolly adelgid in the latter half of the 20th century. The high elevations expose plant life to high levels of pollution, including acid precipitation in the form of rain, snow, and fog. These acids damage the red spruce trees in part by releasing natural metals from the soil, such as aluminum , and by leaching important minerals . To what extent this pollution harms

7566-638: The most isolated. The Cherokee people , who long occupied this area as part of their homeland, called the mountain Attakulla. European-American settlers first called the mountain Black Dome for its rounded shape. They later named it after Elisha Mitchell , a professor at the University of North Carolina , who first explored the Black Mountain region in 1835. He determined that the height of

7663-449: The new river channel, contiguous with the adjacent state. Also, due to a meander in the river, a small part of western Kentucky is contiguous with Tennessee but isolated from the rest of its state. Many of the communities along the Mississippi River are listed below; most have either historic significance or cultural lore connecting them to the river. They are sequenced from the source of the river to its end. The road crossing highest on

7760-620: The past 5,000 years, caused the coastline of south Louisiana to advance toward the Gulf from 15 to 50 miles (24 to 80 km). The currently active delta lobe is called the Birdfoot Delta, after its shape, or the Balize Delta , after La Balize, Louisiana , the first French settlement at the mouth of the Mississippi. The current form of the Mississippi River basin was largely shaped by the Laurentide Ice Sheet of

7857-549: The plume did not mix with the surrounding sea water immediately. Instead, it stayed intact as it flowed through the Gulf of Mexico, into the Straits of Florida , and entered the Gulf Stream . The Mississippi River water rounded the tip of Florida and traveled up the southeast coast to the latitude of Georgia before finally mixing in so thoroughly with the ocean that it could no longer be detected by MODIS. Over geologic time,

7954-484: The range exceeded by several hundred feet that of Mount Washington in New Hampshire . The latter had been commonly thought at the time to be the highest point in the United States east of the Rocky Mountains . Mitchell fell to his death at nearby Mitchell Falls in 1857, where he had returned to verify his earlier measurements. A 4.6-mile (7.4 km) road ( NC 128 ) connects the scenic Blue Ridge Parkway to

8051-537: The remnants thereof). Though humidity levels are often high in locations with humid continental climates, the "humid" designation means that the climate is not dry enough to be classified as semi-arid or arid . By definition, forests thrive within this climate. Biomes within this climate regime include temperate woodlands, temperate grasslands, temperate deciduous or evergreen forests, coniferous forests, and coniferous swamps. Within wetter areas, maple , spruce , pine , fir , and oak can be found. Fall foliage

8148-479: The river, although the Mississippi defines part of the boundary of each of these states. In all of these cases, the middle of the riverbed at the time the borders were established was used as the line to define the borders between adjacent states. In various areas, the river has since shifted, but the state borders have not changed, still following the former bed of the Mississippi River as of their establishment, leaving several small isolated areas of one state across

8245-400: The site of the head of navigation of the river. The Upper Mississippi has a number of natural and artificial lakes, with its widest point being Lake Winnibigoshish , near Grand Rapids, Minnesota , over 11 miles (18 km) across. Lake Onalaska , created by Lock and Dam No. 7 , near La Crosse, Wisconsin , is more than 4 miles (6.4 km) wide. Lake Pepin , a natural lake formed behind

8342-532: The state line still follows the old channel. The town of Kaskaskia, Illinois once stood on a peninsula at the confluence of the Mississippi and Kaskaskia (Okaw) Rivers . Founded as a French colonial community, it later became the capital of the Illinois Territory and was the first state capital of Illinois until 1819. Beginning in 1844, successive flooding caused the Mississippi River to slowly encroach east. A major flood in 1881 caused it to overtake

8439-460: The states of Minnesota , Wisconsin , Iowa , Illinois , Missouri , Kentucky , Tennessee , Arkansas , Mississippi , and Louisiana . The main stem is entirely within the United States; the total drainage basin is 1,151,000 sq mi (2,980,000 km ), of which only about one percent is in Canada. The Mississippi ranks as the world's tenth-largest river by discharge flow, and

8536-585: The steppe ( BSk ) climates. In the eastern and Midwestern United States, Pennsylvania , Ohio , Illinois , Indiana , southern New York , most of Connecticut and Rhode Island , and eastern Massachusetts fall into the hot-summer humid continental climate. In Canada, this climate type exists only over portions of Southern Ontario . In the Eastern Hemisphere, this climate regime is found within interior Eurasia and east-central Asia. Within Europe,

8633-488: The strong Siberian High much colder winter temperatures than similar latitudes around the world, however with lower snowfall, the exception being western Japan with its heavy snowfall. Tōhoku , between Tokyo and Hokkaidō and Western coast of Japan also has a climate with Köppen classification Dfa , but is wetter even than that part of North America with this climate type. A variant which has dry winters and hence relatively lower snowfall with monsoonal type summer rainfall

8730-462: The subalpine climate, and their cones feed the birds along with wild blueberry and blackberry shrubs. The second highest point in eastern North America, Mount Craig at 6,647 feet (2,026 m), is roughly a mile to the north of Mount Mitchell. The summit area of Mount Mitchell is marked by a warm-summer humid continental climate ( Köppen Dfb ), with mild summers and long, moderately cold winters, being more similar to southeastern Canada than

8827-573: The upper and lower river, the Mississippi is further controlled by thousands of wing dikes that moderate the river's flow in order to maintain an open navigation channel and prevent the river from eroding its banks. The head of navigation on the Mississippi is the St. Anthony Falls Lock. Before the Coon Rapids Dam in Coon Rapids, Minnesota , was built in 1913, steamboats could occasionally go upstream as far as Saint Cloud, Minnesota , depending on river conditions. The uppermost lock and dam on

8924-435: The warmest month below 22 °C (72 °F). Summer high temperatures in this zone typically average between 21–28 °C (70–82 °F) during the daytime and the average temperatures in the coldest month are generally well or far below the −3 °C (27 °F) (or 0 °C (32.0 °F)) isotherm. Frost-free periods typically last 3–5 months. Heat spells lasting over a week are rare. The warm summer version of

9021-469: The western expansion of the United States. The river also became the subject of American literature , particularly in the writings of Mark Twain . Formed from thick layers of the river's silt deposits, the Mississippi embayment is one of the most fertile regions of the United States; steamboats were widely used in the 19th and early 20th centuries to ship agricultural and industrial goods. During

9118-479: The world by volume. On average, the Mississippi has 8% the flow of the Amazon River , which moves nearly 7 million cubic feet per second (200,000 m /s) during wet seasons. Before 1900, the Mississippi River transported an estimated 440 million short tons (400 million metric tons) of sediment per year from the interior of the United States to coastal Louisiana and the Gulf of Mexico. During

9215-552: The year, but often these regions do have dry seasons. The definition of this climate in terms of temperature is as follows: the mean temperature of the coldest month must be below 0 °C (32.0 °F) or −3 °C (26.6 °F) depending on the isotherm, and there must be at least four months whose mean temperatures are at or above 10 °C (50 °F). In addition, the location in question must not be semi-arid or arid . The cooler Dfb , Dwb , and Dsb subtypes are also known as hemiboreal climates. Although amount of snowfall

9312-455: The −3 °C (27 °F) average temperature isotherm (line of equal temperature) was near the southern extent of winter snowpack . In the United States, it is more common to use the 0 °C [32.0 °F] isotherm instead. The 10 °C (50 °F) average temperature was found to be roughly the minimum temperature necessary for tree reproduction and growth. Wide temperature ranges are common within this climate zone. Second letter in

9409-500: Was chosen to designate the "true head" of the Mississippi River as a combination of the last four letters of the Latin word for truth ( ver itas ) and the first two letters of the Latin word for head ( ca put ). However, the lake is in turn fed by a number of smaller streams. From its origin at Lake Itasca to St. Louis, Missouri , the waterway's flow is moderated by 43 dams. Fourteen of these dams are located above Minneapolis in

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