Glacial Ice Dam -- Hope ID - Idaho Historical Markers on Waymarking.com

This roadside sign uses pictures and graphics to explain very well the size of a giant glacial ice dam and mechanics of how it, and its damming of Lake Missoula shaped the terrain in this beautiful part of Idaho.

Marker Name: Glacial Ice Dam Marker Type: Roadside Marker Text: GLACIAL ICE DAM Filled This Basin As Far As You Can See Glaciers moved south from Canada spreading across the lake and rivers Glaciers advanced and retreated a dozen times or more Damming Glacial Lake Missoula Bursting with gargantuan force Flooding areas 400 miles away Shaping today’s landscape in Idaho, Washington & Oregon [graphic of ice dam from 150,000 years ago with Seattlr Space Needles for reference] Distant cliffs of the Green Monarchs rise about 2000 ft above the lake Glacial ice above lake level Tall as a 200 story building above lake level Rose 4 times as tall as Seattle’s 605 ft Space Needle Total depth of Glacial Ice may have exceeded 3,500 feet when reaching to the lake’s rock bed Cross-section comparison of Glacian Ice Now & Then [2 graphics -- L graphic] Looking across the top of the glacier [R graphic] Perspective of glacial ice filling Lake Pend Oreille Only the mountains with peaks rising about 4,500 ft. in elevation would have been visible from the top of the glacier More History available from Ice Age Floods Institute" County: Bonner City: Hope Group Responsible for Placement: FHA, IDot, University of ID, Hope Clark Fort Chamber of Commerce Web link(s) for additional information: http://www.glaciallakemissoula.org/story.html and http://www.sandpointonline.com/sandpointmag/sms11/iceageflood.html and http://iafi.org/ Date Dedicated: Not listed Marker Number: Not listed

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Date Logged Log User Rating   08/15/2019 SpanDino visited it 12/22/2016 Benchmark Blasterz visited it

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