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Lewis & Clark's Columbia River - "200 Years Later"
"Camassia Nature Preserve, West Linn, Oregon"
Includes ... Camassia Nature Preserve ... Missoula Floods ...
Image, 2009, Camassia, Oregon, click to enlarge
Click image to enlarge
Camassia trail, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.


Camassia Nature Preserve ...
Camassia Nature Preserve is a 26 acre "park" located in West Linn, Oregon, and was named for the common camas (Camassia quamash), which blooms among the basalt blocks in April and early May. The preserve hosts more than 300 plant species.

According to The Nature Conservancy's Camassia Natural Area's website (2018):

"The rocky plateau was exposed 12,000- 19,000 years ago when the Bretz Floods poured down the present Columbia River Gorge and far into the Willamette Valley. The floods swept soil and vegetation from parts of the valley and deposited granitic boulders (called "glacial erratics") from as far away as Canada." [The Nature Conservancy website, 2018]

Camassia and the Missoula Floods ...

"This place was once covered by more than 100 foot of water. During the end the last ice age, between 12,8000 and 15,000 years ago, a continental ice sheet (glacier) dammed the Clark Fork River near the Idaho-Montana border creating a vast lake. Periodically, the lake broke through the ice dam resulting in colossal floods known as the Bretz or Missoula Ice Age Floods. During the floods, more water coursed across eastern Washington and down the Columbia River Gorge than is found in all the rivers of the world today. The water was 1,000 feet deep when entering the Gorge, and shot out at velocities as high as 90 mph. The water was constricted at the Kalama Narrows and backed up into the Willamette Valley flooding it to a depth of 400 feet.

The force of these floods scoured the more resistant basalt bedrock of Camassia creating its shallow-soiled plateaus, and carved away softer bedrock creating low areas that are now seasonal ponds -- kolk lakes. Icebergs carried by the flood waters brought granite boulders called "erratics" from as far away as Canada. When the icebergs melted, the erratics sank. One such ice-rafted granite erratic can be seen in the quarry near Camassia."

(words from signboard at Camassia natural area)


Source:    "waymarking.com" website, 2018, Camassia and the Missoula Ice Age Floods.

[More]


Nature Trail Stop #8 ...
Nature Trail Stop #8:

"8. Basalt    The bedrock exposed so beautifully here is Yakima basalt from a series of lava flows 15 million years ago. From 19,000 to 12,000 years ago, a series of major floods, the Missoula or Bretz Floods, poured down the present Columbia River Gorge and up the Willamette river valley as far south as Eugene. These floods swept away soils and vegetation from parts of the valley and deposited ice-rafted granite boulders from as far away as Canada." [Camassia brochure, 2004]

Image, 2009, Camassia, Oregon, click to enlarge
Click image to enlarge
Camassia, basalt block, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.


Views ...

Image, 2009, Camassia, Oregon, click to enlarge
Click image to enlarge
Camassia basalt, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia, Oregon, click to enlarge
Click image to enlarge
Camassia trail, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia, Oregon, click to enlarge
Click image to enlarge
Camassia, basalt with wildflowers, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia, Oregon, click to enlarge
Click image to enlarge
Camassia, basalt block and wildflowers, West Linn, Oregon. "Rosy Plectritis" and "Large-flowered Blue-eyed Mary". Chilly overcast day. Image taken April 25, 2009.


Wildflowers (April) ...

Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Avalanche Lily", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Common Camas", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Common Camas", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Large-flowered Blue-eyed Mary", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Large-flowered Blue-eyed Mary", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Rosy Plectritis", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Rosy Plectritis" and "Large-flowered Blue-eyed Mary", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Rosy Plectritis", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Stream Violet", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Sweet Trillium", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Sweet Trillium", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.
Image, 2009, Camassia Nature Preserve, Oregon, click to enlarge
Click image to enlarge
"Wood's Strawberry", Camassia Nature Preserve, West Linn, Oregon. Chilly overcast day. Image taken April 25, 2009.


From the Journals of Lewis and Clark ...

Clark, ...
 




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*River Miles [RM] are approximate, in statute miles, and were determined from USGS topo maps, obtained from NOAA nautical charts, or obtained from the U.S. Army Corps of Engineers website, 2003

Sources:
  • "waymarking.com" website, 2018, "Camassia and the Missoula Ice Age Floods";
  • The Nature Conservancy website, 2018, Camassia Nature Preserve;


All Lewis and Clark quotations from Gary Moulton editions of the Lewis and Clark Journals, University of Nebraska Press, all attempts have been made to type the quotations exactly as in the Moulton editions, however typing errors introduced by this web author cannot be ruled out; location interpretation from variety of sources, including this website author.
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Images are NOT to be downloaded from this website.
July 2018