The Avalanche Atlas is a two part compilation of snow avalanche activity affecting Washington State highways. Part one catalogs details of snow avalanche activity along Chinook, Cayuse, White and Snoqualmie Passes; part two details snow avalanche activity along Stevens Pass and Tumwater Canyon. The Atlas includes descriptive details, historical records, photographs, maps and drawings for each avalanche area.
Part 1, Chinook, Cayuse, White and Snoqualmie Passes has been compiled by several people working in the field. A preliminary survey was made in 1971 by Ray Leonard. Data for Chinook, Cayuse and White Passes were subsequently compiled in 1973 by Norman Wilson and Patti Olson. Data for Snoqualmie Pass were furnished by Al Bennett and others in the Department of Highways. Many persons in the Department maintenance crews furnished historical details and recollections. John Dalle-Molle of the National Park Service was especially helpful with information about Cayuse Pass. Final compilation, editing and field check were by Edward R. LaChapelle. Edward R. LaChapelle, Colin B. Brown and Roger J. Evans are Co-Principle Investigators
July 12, 2007
Edward R. LaChapelle, Colin B. Brown, Roger J. Evans.
University of Washington. Geophysics Program; University of Washington. Dept. of Civl Engineering.
- # of Pages: 109 p., 5,978 KB (PDF)
- Subject: Atlases, Avalanches, Highways, Mountain roads, Mountains, Passes (Mountains), Reconnaissance, Roadside hazards, Snow and ice control, Snow mechanics, Studies, Temperature, Terrain evaluation, Topography, Weather conditions, Winter, Winter maintenance.
- Keywords: Avalanche paths, avalanches, highways, mountains, mountain passes, snowslides, Cascade Mountain Range, SR 410, SR 12,
- Related Publications: Avalanches on the North Cascade Highway (SR-20), (WA-RD 8.1).
North Cascades Highway SR-20 Avalanche Atlas, (WA-RD 8.2).
Avalanche Studies (1971-1972), (WA-RD 8.3).
Methods of Avalanche Control on Washington Mountain Highways: Third Annual Report, (WA-RD 8.4).
Methods of Avalanche Control on Washington Mountain Highways: Interim Report (Fourth Annual Report), (WA-RD 8.5).
Methods of Avalanche Control on Washington Mountain Highways, (WA-RD 8.6).
Avalanche Atlas. Part 2. Stevens Pass and Tumwater Canyon, (WA-RD 8.8.).
This abstract was last modified April 29, 2008