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ABSTRACT: The Upper Mississippi River flows approximately 2000 km from Lake Itasca, Minnesota to Cairo, Illinois where it is confluences with the Ohio River to form the Lower Mississippi River. North of the confluence, numerous snags, sand bars, rapids, and other obstructions made the Upper Mississippi River travel difficult. This paper highlights how the geological and landscape resources of the Upper Mississippi River and tributary watershed were responsible for the successful economic development of this historically rich region of North America. Environmental challenges include an attempt to keep invasive species such as the Asian carp out of the rivers and lakes north of the Twin Cities. In an attempt to protect the Mississippi River resource, Environmental and Conservation groups have opposed continued navigation through Minneapolis and St. Paul and the planned Upper Mississippi River navigation infrastructure restoration by the United States Corps of Engineers including the up

United statesSamuelj indoranteGeralda millerKennethr olsonOpen journalSoil scienceUpper mississippi riverLake itascaOhio riverLower mississippiMississippi riverUnited states corpsJo 2003 the river we have wroughta history of upper mississippi university minnesota pressஒன்றுபட்டது மாநிலங்களில்ஜெரால்டா மில்லர்திறந்த இதழ்