Near Cresent in Klamath County, Oregon — The American West (Northwest)
About 7,700 years ago Mt. Mazama erupted torrents of seething, red-hot pumice and other volcanic rocks. These glowing avalanches raced down the slopes and flooded the valley that lay here with deposits over 100 feet (30 m) deep.
Even after thousands of years, few trees have become established on the Pumice Desert. There is ample water under the surface, but deficiencies in the soil limit plant growth. Many more years will pass before the surrounding lodgepole pines transform the desert to a forest.
(Inscription within the drawing of Mt.Mazama)
Avalanches of heated rocks ejected by Mt. Mazama flooded downhill. Mostly pumice and scoria, the porous rocks discharged gasses that buoyed up the flow. Some rocks travelled up to 25 miles (40 km) beyond this point.
Erected by National Park Service.
Location. 43° 1.636′ N, 122° 7.161′ W. Marker is near Cresent, Oregon, in Klamath County. Marker is on North Crater Lake Highway, on the right when traveling south. Touch for map. The marker is located within the boundaries of Crater Lake National Park on the north entrance road south of the intersection of North Crater Lake Highway and East Diamond Lake Highway. This is a seasonal highway and is closed in the winter. Marker is in this post office area: Crescent OR 97733, United States of America.
Other nearby markers. At least 4 other markers are within 9 miles of this marker, measured as the crow flies. After the Collapse (approx. 8 miles away); Before the Collapse (approx. 8 miles away); Glacial Valleys (approx. 8.1 miles away); Stephen Tyng Mather (approx. 8.1 miles away).
Also see . . .
1. The Pumas Desert. This blog posting offers a photo of the marker with additional photos of the area. (Submitted on February 24, 2013.)
2. The Crater Lake Institute. Offering additional information and a map showing additional geographical points of interests within the Crater Lake National Park. (Submitted on February 24, 2013.)
Categories. • Environment • Natural Features •
Credits. This page was last revised on June 16, 2016. This page originally submitted on February 8, 2013, by Don Morfe of Baltimore, Maryland. This page has been viewed 377 times since then and 10 times this year. Photos: 1, 2, 3. submitted on February 8, 2013, by Don Morfe of Baltimore, Maryland. • Syd Whittle was the editor who published this page.
Editor’s want-list for this marker. Full view of the marker. • Wide area view of the marker and its surroundings. • Can you help?