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2014 Wapama Falls rock fall

A large impact zone beneath the source area at the bottom of a steep rock cliff, separated into two areas by a strip of intact trees.

A large rock fall from the north wall of Hetch Hetchy Valley, from the cliff just east of Wapama Falls resulting in a dust cloud and an obvious large white-colored source area on the cliff east of Wapama Falls. The largest boulders tumbled all the way into the reservoir. Green oak leaves scattered along the reservoir edge suggest an initial air blast that blew the leaves off of oak trees that were subsequently completely buried by rock-fall debris. Roughly 120 m of the Rancheria Trail was completely destroyed in the main impact area, buried under meters of fresh rock debris, and another 30 m of the trail on either side sustained some damage.

UTM East: 257208; UTM North: 4205469; Elevation: 1361

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

Hetch Hetchy
Latitude: 37.9643998245127, Longitude: -119.76377014

Wapama Falls
Yosemite National Park, California
Latitude: 37.8399200439453, Longitude: -119.540397644043

Rock Fall Database GroupID for YOSE : 2014033101
Rock Fall Database ID for YOSE : 2014033101-2

Yosemite Rock Falls Collection

20140403

03/31/2014

Public Can View

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

Wednesday, May 11, 2022 11:53:15 PM

Thursday, July 28, 2022 8:36:39 PM

2014033101_2_NPS.jpg

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