Case study of Donjek debris flow, southwest Yukon

A high-magnitude debris flow occurred in late summer 2000 from tightly folded sedimentary rocks in a steep 2.66 km2 basin in the remote Donjek River valley of southwest Yukon. The debris flow deposited at least 206 344 m3 of material, with a peak discharge on the order of 1000 m3/s. No evidence of any previous events of this magnitude was found at the site. The headscarp is aligned with the strike of a west-plunging overturned syncline in heavily weathered Upper Paleozoic to Upper Triassic argillite, interbedded siltstone and argillite, and thinly bedded limestone. Tree-ring analysis on two white spruce killed by the debris flow indicate that the debris flow occurred in July to early-mid August 2000. The heaviest monthly total precipitation on record (1967-2003) for August occurred in 2000 and most likely played a role in slope failure. The volume and peak discharge estimated are the largest reported from a debris flow occurring in the last 100 years in the St. Elias Mountains.

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Last Updated October 20, 2025, 02:21 (UTC)
Created October 20, 2025, 02:21 (UTC)
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Title
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Case study of Donjek debris flow, southwest Yukon
Description
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A high-magnitude debris flow occurred in late summer 2000 from tightly folded sedimentary rocks in a steep 2.66 km2 basin in the remote Donjek River valley of southwest Yukon. The debris flow deposited at least 206 344 m3 of material, with a peak discharge on the order of 1000 m3/s. No evidence of any previous events of this magnitude was found at the site. The headscarp is aligned with the strike of a west-plunging overturned syncline in heavily weathered Upper Paleozoic to Upper Triassic argillite, interbedded siltstone and argillite, and thinly bedded limestone. Tree-ring analysis on two white spruce killed by the debris flow indicate that the debris flow occurred in July to early-mid August 2000. The heaviest monthly total precipitation on record (1967-2003) for August occurred in 2000 and most likely played a role in slope failure. The volume and peak discharge estimated are the largest reported from a debris flow occurring in the last 100 years in the St. Elias Mountains.
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2011-04-04
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Open Government Licence - Yukon
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https://open.canada.ca/data/en/dataset/98e3cd0f-3783-493a-845e-d64e8f2171d8
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Government of Yukon | Gouvernement du Yukon
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Yukon Geological Survey
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[email protected]
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None
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None
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