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2020 Columbia Rock rock fall

Rock fall source area at the base of a low diagonal ridge. Rocks that slid out from beneath an arching roof resting the slope and talus below.

A rock fall produced a small dust cloud on the tree-covered slope west of Yosemite Falls and above the Upper Falls Trail, where the trail traverses horizontally between Columbia Rock and the "Oh my Gosh" Rock viewpoint. The source of the rock fall was at the base of a low diagonal ridge leading to the Valley rim, at 1926 m elevation. Two triangular blocks slid out from beneath a fractured, arching roof. Most of the rock fell only about 10 m, piling up on the lower-angle slope below, but several boulders, tumbled vertically all the way down the slope to the talus below. These boulders swept across the Upper Yosemite Falls Trail, but did very little damage to the trail, leaving only about 4-5 m3 of rock debris on or adjacent to the trail, plus some broken trees and branches.

UTM East: 270749; UTM North: 4181534; Elevation: 1926

U.S. National Park Service

To the best of our knowledge we believe this image to be copyright free and in the public domain. When using this asset for any purpose, including online, credit: 'Courtesy U.S. National Parks'

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Yosemite National Park, Code: YOSE

Yosemite Falls
Latitude: 37.7524141156204, Longitude: -119.60218768

Columbia Rock
Yosemite National Park, California
Latitude: 37.8399200439453, Longitude: -119.540397644043

Rock Fall Database GroupID for YOSE : 2020033101
Rock Fall Database ID for YOSE : 2020033101-1

Yosemite Rock Falls Collection

20200402

03/31/2020

Public Can View

Organization: Yosemite NP
Position: Park Geologist
Address: El Portal, CA 95318
Email: greg_stock@nps.gov

Wednesday, May 11, 2022 11:41:35 PM

Thursday, July 28, 2022 9:16:53 PM

2020033101_2_NPS.jpg

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Yosemite National Park