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The Current River is roughly 184 miles (296 km) long and drains about 2,641 square miles (6,840 km 2) [4] of land mostly in Missouri and a small portion of land in northeastern Arkansas. The headwaters of the Current River are nearly 900 feet (270 m) above sea level, while the mouth of the river lies around 280 feet (85 m) [ 4 ] above sea level.
The Lower Colorado water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the ...
The upper portion of Turnbull's Bend was referred to as Upper Old River, while the larger, lower portion became known as the Lower Old River. At first, the Lower Old River would flow eastward, to the Mississippi, until 1839, when locals began removing the Great Raft, a natural log jam that was obstructing the Atchafalaya River. The project was ...
Norman's chart of the lower Mississippi River is a historically significant map produced in 1858 of landmarks, roads, ferry crossings, and plantations along the course of the Mississippi River from Natchez to New Orleans. [1] [2] Cotton and sugar plantations are color-coded with distinct colors. [1]
Map showing the Upper and Lower Colorado River Basin, and adjacent areas supplied by Colorado River water. The Colorado River Basin consists of 246,000 square miles (640,000 km 2), making it the seventh largest drainage basin in North America. [1] About 238,600 square miles (618,000 km 2), or 97 percent of the basin, is in the United States. [40]
The political and engineering focus in the 20th century was to separate the Lower Mississippi River from its floodplain.Levees and channelization—along with substantial loss of bottomland forests to agriculture in the alluvial valley—have resulted in a loss of wildlife and fish habitat, decreased water quality, and an expansion of the hypoxic zone in the Gulf of Mexico.
The waterway connects to Lake Superior at its north and south entries (upper and lower portage entry lighthouses), with sections known as Portage Lake and Torch Lake in between. The primary tributary to Portage Lake is the Sturgeon River. The Keweenaw Waterway in winter, looking west toward the Portage Lake Lift Bridge.
The Ohio River at Cairo is 281,500 cu ft/s (7,960 m 3 /s); [1] and the Mississippi River at Thebes, Illinois, which is upstream of the confluence, is 208,200 cu ft/s (5,897 m 3 /s). [66] The Ohio River flow is greater than that of the Mississippi River, so hydrologically the Ohio River is the main stream of the river system.