Lake Chouteau

Map of Montana showing Lake Chouteau.

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Location| Teton, Montana
Coordinates|  [ ⚑ ] : 47°48′44″N 112°11′00″W﻿ / ﻿47.812155°N 112.183268°W﻿ / 47.812155; -112.183268
Lake type| Glacial lake (former)
rivers, streams, precipitation">Primary inflows| Laurentide Ice Sheet
rivers, streams, evaporation">Primary outflows| Lake Great Falls
Basin countries| United States
Max. length| about 20 miles (32 km)
Max. width| about 5 miles (8.0 km)
Surface area| varied
Surface elevation| 3,500 m (11,500 ft)
References| [1]

Lake Chouteau was a glacial lake formed during the late Pleistocene along the Teton River. After the Laurentide Ice Sheet retreated, water melting off the glacier accumulated between the Rocky Mountains and the ice sheet. The lake drained along the front of the ice sheet, eastward towards the Judith River and the Missouri River.

The maximum advance of the Laurentide Ice Sheet blocked the drainages of north- and east-flowing rivers, forming glacial lakes along the margin of the ice. On the western Montana plains the Shelby lobe blocked the [Milk River, creating glacial Lake Twin River. Tributaries of the Marias River were also blocked by the Shelby lobe, leading to the formation of glacial lakes Cutbank and Choteau. The Loma sublobe blocked the Missouri north of the Highwood Mountains, forming glacial Lake Great Falls. A lake also formed in the Musselshell River basin.[2]

## Identification

Scattered limestone boulders and cobbles sitting on bedrock with in the Teton River basin, east of the river outlet from the piedmont glacial lobe and west of Choteau is evidence of several pre-Pinedale piedmont glaciations. The clasts made up of boulders and cobbles from the limestone-rich, mountain-source and is a nonglacial [[Alluvium |alluvium]] of Tertiary age that formerly covered the bedrock surfaces.[3] Paleosols identified as part of the Bull Lake till units or outwash units are weakly developed. They represent two stades of a single glaciation. They are dated from the early Bull Lake lateral moraines in the Glacier National Park at approximately 160 thousand years before present (YBP), the late Bull Lake lateral moraines are approximately 140 thousand YBP.[3]

## See also

* List of prehistoric lakes
* Proglacial lakes of the Missouri River Basin
* Lake Cut Bank
* Lake Chouteau
* Lake Great Falls
* Lake Musselshell
* Lake Jordan
* Lake Glendive
* Lake McKenzie

## References

1. ↑ Physiography and Glacial Geology of Eastern Montana and Adjacent Areas; William C. Alden; United States Government Printing Office: Washington, D.C.; 1932
2. ↑ Geologic Framework and Glaciation of the Central Area, 1-1-2006; Christopher L. Hill; Boise State University, Boise, Idaho; 2006
3. ↑ 3.0 3.1 Map Showing Spatial and Temporal Relations of Mountain and Continental Glaciations on the Northern Plains, Primarily in Northern Montana and Northwestern North Dakota; David S. Fullerton, Roger B. Colton, Charles A. Bush, and Arthur W. Straub; Pamphlet to accompany Scientific Investigations Map 2843; U.S. Department of the Interior, U.S. Geological Survey; Washington, D.C., 2004

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Pleistocene proglacial lakes and related seas

Africa|

* Lake Makgadikgadi

Asia|

* West Siberian Glacial Lake
* Lake Tengger

Europe|

* Ancylus Lake
* Baltic Ice Lake
* Lake Harrison
* Lake Komi
* Lake Lapworth
* Lake Pickering
* Littorina Sea
* Mastogloia Sea
* Yoldia Sea

North America|

| Nelson River drainage|

* Proglacial lakes of Minnesota
* Lake Agassiz
* Lake Bassano
* Lake Souris

|

James Bay drainage|

* Lake Ojibway
* Tyrrell Sea

Great Lakes|

* Lake Admiralty
* Lake Algonquin (Multiple basins)
* Lake Arkona
* Lake Chicago
* Lake Chippewa
* Lake Duluth
* Early Lake Erie
* Lake Frontenac
* Lake Houghton (glacial)
* Glacial Lake Iroquois
* Lake Lundy
* Lake Dana
* Lake Maumee
* Lake Minong
* Nipissing Great Lakes (Multiple basins)
* Early Lake Ontario
* Lake Saginaw
* Lake Stanley
* Lake Tonawanda
* Lake Warren
* Lake Wayne
* Lake Whittlesey
* Champlain Sea

Columbia River system|

* Lake Allison
* Lake Bonneville
* Glacial Lake Columbia
* Lake Lahontan
* Lake Lewis
* Lake Missoula

Puget Sound system|

* Glacial Lake Russell
* Glacial Lake Hood
* Lake Nisqually
* Lake Puyallup
* Glacial Lake Sammamish
* Lake Skokomish

Upper Missouri River|

* Lake Cut Bank
* Lake Chouteau
* Lake Great Falls
* Lake Circle
* Lake Jordan (Montana)
* Lake Musselshell
* Lake Glendive
* Lake McKenzie

Upper Mississippi drainage|

* Lake Kankakee
* Kankakee Outwash Plain
* Lake Wisconsin

Ohio drainage|

* Lake Monongahela
* Lake Tight
* Teays River

Hudson valley|

* Lake Albany
* Lake Passaic

New England|

* Lake Cape Cod
* Lake Connecticut
* Lake Hitchcock
* Lake Merrimack
* Lake Nantucket Sound
* Lake Stowe

California|

* Lake Cahuilla
* Lake Corcoran
* Lake Harper
* Lake Manix
* Lake Manly
* Lake Mojave
* Lake Panamint
* Lake Russell
* Lake Tecopa
* Lake Thompson

New Mexico|

* Lake Palomas

Alaska|

* Lake Atna

South America|

* Lake Ballivián
* Cabana
* Lake Escara
* Inca Huasi
* Mataro
* Lake Minchin
* Ouki
* Sajsi
* Salinas
* Lake Tauca
* Great Tehuelche Paleolake

Summary|

* List of prehistoric lakes

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