In the Path of Cataclysmic Floods

In the Path of Cataclysmic Floods (HM1KE8)

Location: LaCrosse, WA 99143 Franklin County
Country: United States of America

N 46° 39.823', W 118° 13.628'

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Inscription
You are standing in the pathway of some of the largest floods ever known. They carved steep-walled canyons, sculpted immense waterfalls, and left behind landscapes found nowhere else on earth.

Massive Glacial Dams and Lakes
During the last Ice Age, a lobe of ice at least a half-mile high blocked the Clark Fork River in Idaho, creating an enormous lake called Glacial Lake Missoula. This ice dam failed - over and over - sending billions of tons of water rampaging across the land.

Raging Journey to the Pacific
The thundering torrent of water, icebergs, and mud raced at speeds up to 60 mph, stripping away tons of soil and rock. The floodwaters raged across eastern Washington, through the Columbia River Gorge, and to the ocean.

How Many Floods Were There?
No one knows for sure, but geologists discovered evidence the Lake Missoula and other glacial lakes filled and emptied many times during the last Ice Age.

(Left Illustration Caption)
At times, the ice dams was more than two miles wide and 30 miles long.

(Center Illustration Caption)
Pressure from rising water caused the ice dam to leak and crack. Over time, water began pouring from large fractures beneath the surface, eroding the dam from below until it suddenly failed.

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You can visit many of the remarkable features created by the Ice Age floods, including Dry Falls, Steamboat Rock, and Beacon Rock.
Details
HM NumberHM1KE8
Tags
Placed ByWashington State Parks
Marker ConditionNo reports yet
Date Added Wednesday, May 6th, 2015 at 2:01pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)11T E 406123 N 5168526
Decimal Degrees46.66371667, -118.22713333
Degrees and Decimal MinutesN 46° 39.823', W 118° 13.628'
Degrees, Minutes and Seconds46° 39' 49.38" N, 118° 13' 37.68" W
Driving DirectionsGoogle Maps
Area Code(s)509
Closest Postal AddressAt or near Palouse Falls Rd, LaCrosse WA 99143, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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