Detailed Accident Report

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Date: 2007-03-09
Submitted By: WWAN
Place: Hall Mountain, Monashee Range, South Columbia Mountains
State: BC
Country: CANADA
Fatalities: 2
Summary: 4 snowmobilers caught, 2 partially buried, 2 buried and killed

***Report from Canadian Avalanche Centre***

Please visit:

Canadian Avalanche Centre

Box 2759, Revelstoke, BC V0E 2S0

ph: (250) 837-2435 / fax: (250) 837-4624 /

Canadian Avalanche Centre Accident Information Report

March 11, 2007

This avalanche accident involved the February 4th surface hoar layer that we have

been monitoring and warning about. Please refer to the Current Conditions Special

Report at for more information regarding this concerning

snowpack layer. Also, bulletins issued since Feburary 5th for the South Columbia

region warn of the dangers associated with this layer. These can be found by

navigating to the Archived Bulletins page on the CAC website. ? CAC Forecasters

Source: British Columbia Coroner Service

Date: March 9, 2007 Time: 1555

Location: Hall Mountain, Monashee Range, South Columbia Mountains

Elevation: approx. 1650 m to 1350 m Aspect: West

Slope Angle: Est. 35 degrees

Slope Configuration: Cut block

Start Zone - Convex

Track - Small gulley feature channeled flow

Runout - Open slope

Size: 3

Type: Slab

Length: approx. 300 m

Width: 130 m

Slab Thickness: 86 cm to 96 cm

Failure layer: Feburary 4th surface hoar

Trigger: Snomobile, accidental (Ma)

Avalanche Danger: Considerable

Weather: Overcast with light rain

A group of four snowmobilers were traveling through a cut block on the west side of Hall

Mountain when one of them triggered a size 3 slab avalanche. A twenty year old male

Washington resident and a thirty-seven year old male B.C resident were completely

buried and did not survive the accident, despite rescue attempts. The two surviving group

members were caught in the avalanche and partially buried.

All four members of the group were well equipped with safety gear including avalanche

transceivers, shovels and probes. Another group in the area assisted with the rescue and

the victims were recovered within five to ten minutes. The victims were found buried

under two metres of debris and resuscitation attempts were unsuccessful.

We present this information to help recreational backcountry users by informing them of

snow, weather, or terrain characteristics associated with backcountry avalanche accidents.

We hope that this information can be used to prevent similar accidents and will help to

raise awareness of avalanche accidents.

This information may be preliminary and incomplete, and may be superseded by

official information from the Coroner?s office at a later date. The Canadian

Avalanche Centre cannot verify the accuracy of this information.