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2015 Dog Rock debris flow

Fresh boulders, gravel, broken branches, and mud completely bury both lanes of a road.

A very intense thunderstorm at the western park boundary generated large debris flows within areas burned by the Dog Rock and El Portal fires. The largest debris of this storm occured from the colluvial slope above El Portal Road and below Parkline Slab between Windy Point and Parkline, within the area burned by the Dog Rock fire. Both lanes of El Portal Road were completely covered by rocks exceeding 1 meter in diameter, and at the thickest point the debris overtopped the approximately 1 meter tall rock wall lining the eastbound lane.

UTM East: 257711; UTM North: 4173584; Elevation: 737

U.S. National Park Service

Restrictions apply on use and/or reproduction (Copyrighted material): This Item is protected by copyright and/or related rights. Copyright: Delisle, Dan

Dan Delisle

Restrictions apply on use and/or reproduction:Copyright Unknown

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Yosemite National Park, Code: YOSE

Merced River Gorge
Latitude: 37.6774815570045, Longitude: -119.74738139

El Portal Road
Yosemite National Park, California
Latitude: 37.8399200439453, Longitude: -119.540397644043

Rock Fall Database GroupID for YOSE : 2015072102
Rock Fall Database ID for YOSE : 2015072102-2

Yosemite Rock Falls Collection

20150721

07/21/2015

Public Can View

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

Wednesday, May 11, 2022 11:50:40 PM

Tuesday, August 9, 2022 5:38:31 PM

2015072102_2_Dan_Delisle.jpg

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Yosemite National Park