On October 15, 2015 at 0901 UTC, the Medicine Hat VOR (YXH) in Canada will be decommissioned. This affects routes that include J477 past the US/Canadian border. Flight plans using this airway to fly into Canada will be rejected upon filing. To compensate, a new waypoint called OTVUK will be established October 15th on the US/Canada border where J477 previously crossed it. Pilots can file direct from GGW to this or other waypoints such as VESDO or TOVUM when flying into Canada.
The NavCanada notice of this change can be found here.