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“Bite-Size Bits of Local, National, and Global History”

Near Minnesota City in Winona County, Minnesota — The American Midwest (Upper Plains)
 

Geology of Minnesota

Mississippi River

 
 
Geology of Minnesota Marker image. Click for full size.
By Cosmos Mariner, August 10, 2013
1. Geology of Minnesota Marker
Inscription.  In its traverse of 2400 miles from Lake Itasca to the Gulf of Mexico, the Mississippi River falls 1475 feet, nearly two-thirds of which is within or along the eastern side of Minnesota. For 300 miles from Minneapolis, its course lies between rocky bluffs bounding a valley from one to six miles in width. The gorge has existed throughout the Pleistocene period of geologic time, during which it has served as a drainage channel for meltwaters from the glaciers of the Great Ice Ages.

The melting of the ice at the end of each glacial epoch produced torrential floods which scoured the valley 200 feet below the present river surface. During the inter-glacial stages, after the ice had melted, the river, greatly reduced in volume and no longer able to transport sand and gravel, filled its valley to the present level.

The history of the Mississippi River during the last million years, while Minnesota and Wisconsin were undergoing repeated glaciation, is characterized by corresponding cycles of erosion and channel filling. The latter being the phase in which it is now engaged.

Erected by the Geological Society of Minnesota
in
Geology of Minnesota Marker Kiosk image. Click for full size.
By Cosmos Mariner, August 10, 2013
2. Geology of Minnesota Marker Kiosk
(upper of two markers in this kiosk)
cooperation with the Department of Highways
State of Minnesota
1960

 
Erected 1960 by Geological Society of Minnesota and State of Minnesota Department of Highways.
 
Topics. This historical marker is listed in this topic list: Waterways & Vessels.
 
Location. 44° 9.589′ N, 91° 48.723′ W. Marker is near Minnesota City, Minnesota, in Winona County. Marker can be reached from U.S. 61 0.3 miles north of Bass Camp Lane, on the right when traveling north. Marker is mounted in kiosk on north side of visitor parking lot at U.S. Army Corps of Engineers Mississippi Lock and Dam No. 5 site. Touch for map. Marker is at or near this postal address: 12554 US Highway 61, Minnesota City MN 55959, United States of America. Touch for directions.
 
Other nearby markers. At least 8 other markers are within 12 miles of this marker, measured as the crow flies. Lock & Dam No. 5 (here, next to this marker); Fountain City (approx. 5.1 miles away in Wisconsin); a different marker also named Fountain City (approx. 5.6 miles away in Wisconsin); We-No-Nah (approx. 11.2 miles away); Winona County Courthouse (approx. 11.3 miles away); Potters' Field (approx. 11˝ miles away); Winona County Soldiers and Sailors Memorial (approx. 11˝ miles away); Stephen Taylor (approx. 11˝ miles away).
 
Geology of Minnesota Marker image. Click for full size.
By Cosmos Mariner, August 10, 2013
3. Geology of Minnesota Marker
(marker mounted in kiosk on north side of visitor parking lot)
Mississippi Lock & Dam № 5 image. Click for full size.
By Cosmos Mariner, August 10, 2013
4. Mississippi Lock & Dam № 5
(view from observation deck near marker)
 
 
Credits. This page was last revised on February 9, 2021. It was originally submitted on February 9, 2021, by Cosmos Mariner of Cape Canaveral, Florida. This page has been viewed 40 times since then. Photos:   1, 2, 3, 4. submitted on February 9, 2021, by Cosmos Mariner of Cape Canaveral, Florida.
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Feb. 25, 2021