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The Great Missoula Floods By Matthew Wilson, ISU Geosciences Geol 402 project,
2004
http://www.iceagefloodsinstitute.org/
www.mines.edu/academic/geology/faculty/klee/missoula.doc
History of Lake MissoulaHistory of Lake Missoula
http://nwcreation.net/articles/missoulaflood.htm
Interesting FactsInteresting Facts
Volume: 2200 cubic Km Volume: 2200 cubic Km (slightly larger than Lake (slightly larger than Lake Erie and Ontario combined) Lake Bonneville 22,000 cubic kmErie and Ontario combined) Lake Bonneville 22,000 cubic km
Area: 7500 square KmArea: 7500 square KmDepth: 700 mDepth: 700 mDischarge: 17 million cubic m/s Discharge: 17 million cubic m/s (would drain lake (would drain lake Erie in eight hours)Erie in eight hours)
Velocity: up to 45 m/s Velocity: up to 45 m/s (100mph)(100mph)
Occurrence: at least 1 of above Occurrence: at least 1 of above magnitudes (40 magnitudes (40 –– 89 smaller floods)89 smaller floods)
Rainbow Lake
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www.mines.edu/academic/geology/faculty/klee/missoula.doc
Evidences of Lake MissoulaEvidences of Lake MissoulaMt Jumbo
Shore lines
Mission Mountains near Flathead LakeMission Mountains near Flathead Lake
http://www.pbs.org/wgbh/nova/megaflood/scab-nf.html
www.mines.edu/academic/geology/faculty/klee/missoula.doc
Ripples at Camas Prairie, MontanaRipples at Camas Prairie, MontanaAmplitude: up to 15mAmplitude: up to 15m
Wavelength: up to 150mWavelength: up to 150m
www.mines.edu/academic/geology/faculty/klee/missoula.doc
Scablands, northeastern WashingtonScablands, northeastern Washington
www.mines.edu/academic/geology/faculty/klee/missoula.doc
Main Channels of FloodMain Channels of Flood
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www.mines.edu/academic/geology/faculty/klee/missoula.doc
Dry FallsDry FallsLargest water fall in the world 117mLargest water fall in the world 117m
““Colossal CataractColossal Cataract””
www.mines.edu/academic/geology/faculty/klee/missoula.doc
Palouse Falls & GorgePalouse Falls & Gorge56 m. tall56 m. tall
120 m from top of falls to skyline120 m from top of falls to skyline
www.mines.edu/academic/geology/faculty/klee/missoula.doc
Multnomah FallsMultnomah FallsColumbia River GorgeColumbia River Gorge
Multnomah Falls in the Columbia River Gorge was created when floodwaters incised the main canyon.
www.mines.edu/academic/geology/faculty/klee/missoula.doc
DepositsDeposits
Pendant bar with ripples at confluence of Palouse and Snake Rivers
Fore-sets in bar dip 26 degrees
www.mines.edu/academic/geology/faculty/klee/missoula.doc
ErraticsErratics
www.mines.edu/academic/geology/faculty/klee/missoula.doc
ReferencesReferencesWeb siteshttp://www.iceagefloodsinstitute.org/trail.htmlhttp://imnh.isu.edu/digitalatlas/counties/bonner/misfld.htmhttp://nwcreation.net/articles/missoulaflood.htmhttp://192.211.16.13/curricular/energies/Aprojfolder/missoula/Title.htmhttp://www.iceagefloodsinstitute.org/http://www.pnl.gov/cms/program/flood.stmhttp://www.pbs.org/wgbh/nova/megaflood/fantastic.htmlhttp://www.pbs.org/wgbh/nova/megaflood/scab-nf.htmlhttp://rickandsidney.com/missoula_flood_research.htmhttp://students.washington.edu/dfinlays/classes/geology201/floodpres/img6.htmwww.mines.edu/academic/geology/faculty/klee/missoula.doc
www.emporia.edu/earthsci/student/corley2/missoula.htm
Parfit, Michael. The floods That Carve the West. The Smithsonian.
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