Debris flow from 2012 failure of moraine-dammed lake, Three Fingered Jack volcano, Mount Jefferson Wilderness, Oregon

Scientific Investigations Report 2014-5208
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Abstract

In the late spring or early summer of 2012, a flood emanated from a small moraine-dammed lake on the northeast flank of Three Fingered Jack in the Mount Jefferson Wilderness. Channel erosion or slope collapse breached the natural dam of the lake, leading to a sudden lowering of lake level by 2.8 m and discharge of 12,700 cubic meters (m3) of water. The resulting debris flow formed a bouldery deposit extending about 0.35 km downslope.

 

The Three Fingered Jack debris flow is one of several that have issued from moraine-dammed lakes in the Oregon Cascade Range. A thorough summary of those lakes and the hazards associated with them was published in 2001, based largely on fieldwork by Jim O’Connor and Jasper Hardison in the early 1990s. Described here are details of the 2012 event, an update to the O’Connor story begun earlier.

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Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Debris flow from 2012 failure of moraine-dammed lake, Three Fingered Jack volcano, Mount Jefferson Wilderness, Oregon
Series title Scientific Investigations Report
Series number 2014-5208
DOI 10.3133/sir20145208
Year Published 2014
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Volcano Science Center
Description v, 13 p.
Country United States
State Oregon
Other Geospatial Moraine-Dammed Lake, Mount Jefferson Wilderness, Three Fingered Jack Volcano
Datum World Geodetic System Datum of 1984
Projection Universal Transverse Mercator projection
Online Only (Y/N) Y
Additional Online Files (Y/N) N