At around 3:25 in the early morning of August 6, 2010, a massive rock avalanche roared down the full length of Capricorn Creek. The debris reached the confluence with Meager Creek, crossed Meager Creek, and then [px]Meager1.jpg[c]T-boned[/px] into the opposite bank. The momentum carried the debris about 150 m up the opposite bank, stripping this slope of trees and soil.
A portion of the debris created a dam across Meager Creek, but most of it was deposited downstream along Meager Creek to the confluence with the Lillooet River. Whatever was still moving continued some distance downstream along the southwest bank of the Lillooet River. Part of the main Lillooet River channel was blocked, backing up the river flow and then altering the flow by creating a new channel. Meager Creek was completely blocked off by the debris dam, which held for more than a day, creating a [px]Meager7.jpg[c]short lived lake[/px] on the upstream side. See [px]Map.jpg[c]map of approximate extent[/px].
The nearest human habitation is [px]Meager17.jpg[c]farmland[/px] located about 30 km downstream from the terminus of the debris. The nearest urban area is Pemberton, located about 55 km downstream. An evacuation alert was issued for downstream residents because a catastrophic failure of the Meager dam could have sent a tsunami of muddy water down the river. The alert was lifted after Meager Creek cut a channel through the dam, which subsequently led to the gradual draining of the lake.
The bridge across Capricorn Creek as well as several kilometres of the Meager Creek logging road were obliterated. The bridge across the the Lillooet River may have [px]Meager6.jpg[c]floated off its foundations[/px]... To see the full trip report you must login as a paid member. Use the Login Page. (message p3)
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