594f5345524f434b2022020150426011

2015 O'Shaughnessy Dam rock fall

Fresh boulders and rock debris scattered across a concrete dam in front of a tunnel through rock.

A rock fall occurred from above the north abutment of O'Shaughnessy Dam, directly above the access tunnel that serves as a backcountry trailhead. Approximately 20 m3 of rock fell roughly 30 m from near the top of the short cliff and landed on the northern part of the dam, breaking apart into small blocks. The dam sustained minor damage to the concrete railings on the east side, as well as a severed cable providing electricity to the tunnel lights.

UTM East: 254933; UTM North: 4203781; Elevation: 1193

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: 37.9485929527079, Longitude: -119.78906386

O'Shaughnessy Dam
Yosemite National Park, California
Latitude: 37.8399200439453, Longitude: -119.540397644043

Rock Fall Database GroupID for YOSE : 2015042601
Rock Fall Database ID for YOSE : 2015042601-1

Yosemite Rock Falls Collection

20150426

04/26/2015

Public Can View

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

Wednesday, May 11, 2022 11:51:51 PM

Thursday, July 28, 2022 8:40:05 PM

2015042601_1_NPS.jpg

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Yosemite National Park