Missouri River Trench
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The '''Missouri River Trench''' is the [[geology|geological]] name applied to the broad valley of the [[Missouri River]] as it flows southward through [[North Dakota]] and [[South Dakota]] in the [[United States]].
The '''Missouri River Trench''' is the [[geology|geological]] name applied to the broad valley of the [[Missouri River]] as it flows southward through [[North Dakota]] and [[South Dakota]] in the [[United States]].
The valley averages approximately {{convert|1|mi|km|abbr=on}} wide, with the valley floor averaging between {{convert|300|and|600|ft|m|abbr=on}} below the surrounding bluffs. The valley was extensively dammed between 1946 and 1966 to provide a series of reservoirs in the Dakotas. Geologically, the valley separates the main [[plateau]] of the [[Great Plains]] to the west from the [[Missouri Coteau]] to the east. The valley averages approximately {{convert|1|mi|km}} wide, with the valley floor averaging between {{convert|300|and|600|ft|m}} below the surrounding bluffs. The valley was extensively dammed between 1946 and 1966 to provide a series of reservoirs in the Dakotas. Geologically, the valley separates the main [[plateau]] of the [[Great Plains]] to the west from the [[Missouri Coteau]] to the east.
Although [[Tillage|cultivation]] has added markedly to the sediment in the river as it flows through the valley, the water was turbid even before the widespread introduction of [[agriculture]], according to early [[Ethnic groups in Europe|European]] travellers. [[Erosion]] and [[deposition (geology)|deposition]] are believed to be in equilibrium in the trench. [[Silt]]ation now provides a major challenge for the impounded sections of the river in the valley. Although [[Tillage|cultivation]] has added markedly to the sediment in the river as it flows through the valley, the water was turbid even before the widespread introduction of [[agriculture]], according to early [[Ethnic groups in Europe|European]] travellers. [[Erosion]] and [[deposition (geology)|deposition]] are believed to be in equilibrium in the trench. [[Silt]]ation now provides a major challenge for the impounded sections of the river in the valley.
== References == {{Reflist}}
==External links== ==External links== Line 11: Line 14:
[[Category:Missouri River]] [[Category:Missouri River]]
{{NorthDakota-geo-stub}} {{NorthDakota-geo-stub}}
The valley averages approximately {{convert|1|mi|km|abbr=on}} wide, with the valley floor averaging between {{convert|300|and|600|ft|m|abbr=on}} below the surrounding bluffs. The valley was extensively dammed between 1946 and 1966 to provide a series of reservoirs in the Dakotas. Geologically, the valley separates the main [[plateau]] of the [[Great Plains]] to the west from the [[Missouri Coteau]] to the east. The valley averages approximately {{convert|1|mi|km}} wide, with the valley floor averaging between {{convert|300|and|600|ft|m}} below the surrounding bluffs. The valley was extensively dammed between 1946 and 1966 to provide a series of reservoirs in the Dakotas. Geologically, the valley separates the main [[plateau]] of the [[Great Plains]] to the west from the [[Missouri Coteau]] to the east.
Although [[Tillage|cultivation]] has added markedly to the sediment in the river as it flows through the valley, the water was turbid even before the widespread introduction of [[agriculture]], according to early [[Ethnic groups in Europe|European]] travellers. [[Erosion]] and [[deposition (geology)|deposition]] are believed to be in equilibrium in the trench. [[Silt]]ation now provides a major challenge for the impounded sections of the river in the valley. Although [[Tillage|cultivation]] has added markedly to the sediment in the river as it flows through the valley, the water was turbid even before the widespread introduction of [[agriculture]], according to early [[Ethnic groups in Europe|European]] travellers. [[Erosion]] and [[deposition (geology)|deposition]] are believed to be in equilibrium in the trench. [[Silt]]ation now provides a major challenge for the impounded sections of the river in the valley.
== References == {{Reflist}}
==External links== ==External links== Line 11: Line 14:
[[Category:Missouri River]] [[Category:Missouri River]]
{{NorthDakota-geo-stub}} {{NorthDakota-geo-stub}}