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lake great falls wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 bibliography 2 see also 3 references toggle the table of contents lake great falls 2 languages deutsch українська edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide coordinates 47 30 14 n 111 17 11 w 47 503784 n 111 286353 w 47 503784 111 286353 from wikipedia the free encyclopedia prehistoric lake in what is now central montana lake great falls glacial lake great falls lake great falls location within montana location cascade montana coordinates 47 30 14 n 111 17 11 w 47 503784 n 111 286353 w 47 503784 111 286353 1 lake type glacial lake former primary inflows laurentide ice sheet primary outflows along the face of the ice sheet basin countries united states max length about 26 miles 42 km max width about 7 8 miles 12 6 km surface area varied surface elevation 3 500 m 11 500 ft references 2 lake great falls was a prehistoric proglacial lake which existed in what is now central montana in the united states between 15 000 bce and 11 000 bce 3 4 5 centered on the modern city of great falls montana glacial lake great falls extended as far north as cut bank montana and as far south as holter lake 6 at present day great falls the glacial lake great falls reached a depth of 600 feet 183 metres 7 approximately 1 5 million years ago the missouri river the yellowstone river and musselshell river all flowed northward into a terminal lake 8 9 during the last glacial period the laurentide and cordilleran ice sheets pushed these lakes and rivers southward 3 8 between 15 000 bce and 11 000 bce the laurentide ice sheet blocked the missouri river and created glacial lake great falls 3 4 5 about 13 000 bce as the glacier retreated glacial lake great falls emptied catastrophically in a glacial lake outburst flood 5 the meltwater poured through the highwood mountains and eroded the hundred mile long 500 foot deep 150 m shonkin sag one of the most famous prehistoric meltwater channels in the world 10 map of montana showing glacial lakes bibliography edit alden w c 1958 physiography and glacial geology of eastern montana and adjacent areas u s geological survey professional paper 174 colton r b lemke r w and lindvall r m 1961 glacial map of montana east of the rocky mountains u s geological survey miscellaneous geological investigations map i 327 lindvall r m 1962 geology of the eagle buttes quadrangle chouteau county montana u s geological survey miscellaneous geological investigations map i 349 thornbury w d 1965 regional geomorphology of the united states john wiley sons inc new york see also edit list of prehistoric lakes proglacial lakes of the missouri river basin lake cut bank lake chouteau lake great falls lake musselshell lake jordan lake circle lake glendive lake mckenzie references edit dewiki physiography and glacial geology of eastern montana and adjacent areas william c alden united states government printing office washington d c 1932 1 2 3 montagne j l quaternary system wisconsin glaciation geologic atlas of the rocky mountain region denver rocky mountain association of geologists 1972 1 2 hill christopher l and valppu seppo h geomorphic relationships and paleoenvironmental context of glaciers fluvial deposits and glacial lake great falls montana current research in the pleistocene 14 1997 hill christopher l pleistocene lakes along the southwest margin of the laurentide ice sheet current research in the pleistocene 17 2000 hill christopher l and feathers james k glacial lake great falls and the late wisconsin episode laurentide ice margin current research in the pleistocene 19 2002 reynolds mitchell w and brandt theodore r geologic map of the canyon ferry dam 30 x 60 quadrangle west central montana u s geological survey scientific investigations map 2860 scale 1 100 000 scientific investigations map 2860 washington d c u s geologic survey 2005 1 2 3 feathers james k and hill christopher l luminescence dating of glacial lake great falls montana u s a archived 2014 11 29 at the wayback machine xvi international quaternary association congress stratigraphy and geochronology session international quaternary association reno 2003 kidston martin j prehistoric find helena independent record june 20 2004 alt david and hyndman donald w roadside geology of montana missoula mont mountain press publishing 1986 isbn 0 87842 202 1 stickney michael c quaternary geology and faulting in the helena valley in 1987 guidebook for the helena area west central montana guidebook for the 12th annual field conference richard b berg and ray h breuninger eds montana bureau of mines and geology special publication 95 helena mont montana bureau of mines and geology 1987 1 2 clawson roger and shandera katherine a billings the city and the people helena mont farcountry press 1998 isbn 1 56037 037 8 mcrae w c and jewell judy moon montana 7th ed cambridge massachusetts publicaffairs 2009 isbn 1 59880 014 0 axline jon and bradshaw glenda clay montana s historical highway markers rev ed helena mont montana historical society 2008 isbn 0 9759196 4 4 bowman isaiah forest physiography physiography of the united states and principles of soils in relation to forestry american environmental studies reprint ed charles gregg ed new york arno press 1970 isbn 0 405 02659 5 v t e pleistocene proglacial lakes and related seas africa lake makgadikgadi lake ptolemy antarctica lake washburn asia lake bandung lake tengger mundafan west siberian glacial lake europe baltic sea ancylus lake baltic ice lake littorina sea mastogloia sea yoldia sea russia lake komi great britain lake eskdale lake harrison lake lapworth lake pickering north america nelson river drainage lake agassiz lake bassano lake souris proglacial lakes of minnesota james bay drainage lake ojibway tyrrell sea great lakes champlain sea lake admiralty lake algonquin multiple basins lake arkona lake chicago lake chippewa lake dana lake duluth early lake erie lake frontenac lake houghton glacial glacial lake iroquois lake lundy lake maumee lake minong nipissing great lakes multiple basins early lake ontario lake saginaw lake stanley lake tonawanda lake warren lake wayne lake whittlesey columbia river system lake allison glacial lake columbia lake lewis glacial lake missoula great basin system lake bonneville lake lahontan puget sound system glacial lake hood lake nisqually lake puyallup glacial lake russell glacial lake sammamish lake skokomish upper missouri river lake chouteau lake circle lake cut bank lake glendive lake great falls lake jordan montana lake mckenzie lake musselshell 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 modoc lake mojave lake panamint lake russell lake tecopa lake thompson rio grande rift lake alamosa lake estancia lake palomas lake san agustín 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 geography portal history portal lakes portal oceans portal retrieved from https en wikipedia org w index php title lake_great_falls oldid 1366212903 categories former lakes of the united states geology of montana glacial lakes of the united states natural history of montana proglacial lakes great falls montana hidden categories articles with short description short description matches wikidata use american english from july 2025 all wikipedia articles written in american english pages using gadget wikiminiatlas coordinates on wikidata articles using infobox body of water without alt articles using infobox body of water without pushpin map alt articles using infobox body of water without image bathymetry webarchive template wayback links this page was last edited on 26 july 2026 at 21 59 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation 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