There is a new Yukon Basemap available for the Yukon which includes an updated road network and the latest topographic information from the CanVec layers.
It is available on the GeoYukon application and via the web service for other applications:
This basemap will replace the previous Basemap (BaseMap_Cache), which is based on older roads information and the old National Topographic Database layers. This basemap service is considered to be legacy.
Legacy - http://mapservices.gov.yk.ca/arcgis/rest/services/BaseMap_Cache/MapServer
For more information or concerns contact Geomatics.Help@gov.yk.ca.