Abstract: This report provides comprehensive documentation of landslide, permafrost subsidence and fluvial erosion-related geohazards for the Yukon portion of the Dempster Highway. It provides Yukon Department of Highways and Public Works – Transportation Engineering Branch a practical geohazard inventory that will help guide planning and mitigate future risk to the highway. It also becomes a valuable reference pertaining to slope stability, permafrost and fluvial processes in northern Yukon.
Results from this study identified 54 mass movement geohazards and 102 meander-highway encroachment sites with the potential for future highway impact. Of particular significance, 75% of the mapped mass movement geohazards are influenced by permafrost or degrading permafrost, an important geological attribute considering future temperatures are expected to increase.

Authors: McKillop, R.J., Brown, C.E., McParland, D.J., Sacco, D.A. and Coates, J.

Keywords: active layer detachment slide, climate change, Community Hazards, debris flow, debris slide, Engineer Creek, fluvial processes, geohazards, Geological Hazards, landslide mapping, mass wasting, meander migration, Ogilvie Mountains, Permafrost, retrogressive thaw slump, riprap, rockfall, slope stability, thermokarst

NTS Mapsheet(s): 116B01, 116B02, 116B07, 116B08, 116B09, 116B16, 116G01, 116G08, 116G09, 116G16, 116H13, 116I03, 116I07, 116I09, 116I10, 116I16

Citation: McKillop, R.J., Brown, C.E., McParland, D.J., Sacco, D.A. and Coates, J., 2016. Inventory of mass movement geohazards along the Dempster Highway, Yukon. Yukon Geological Survey, Miscellaneous Report 17, 61 p. plus appendices.

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