Elk in Jackson Hole Wyoming have had their migration route cut off and have come to rely on state and federal feedlots, in what is known as the National Elk Refuge. Jackson Hole, Wyoming is home to deer, pronghorn, and elk along with other animals. Jackson Hole is lovely during the summer, but not very life sustaining during the winter months. Elk did not winter there before their migration route was cut off by development.
The deer and pronghorn are still able to migrate, using the Gros Ventre River, to Green River, out to Pinedale and Rock Springs. This area needs to be kept open from development for the deer and pronghorn migration, but there is always more new development pushing in.
A question has been raised, can a migration route be created and could the elk migrate again? After looking at the question and consequences of the action, Angus M. Thuermer Jr., says "no." Many of the elk have already contracted brucellosis, and the infection could be detrimental to the cattle industry. Also the cattle eat all the natural forage around the area all summer long, there would not be much left, if any, for the elk to winter on. From The Wildlife News .