Jackson Hole herd is not the only long pronghorn migration-
Most people who follow wildlife news the West now know about the epic migration of the the pronghorn in Jackson Hole from summer to winter on desert south of Pinedale, WY and the big squeeze being put on this migration by the gas industry and subdivisions. They are also aware of the major effort to keep the migration route from being blocked.
Idaho has its own migrations too. They are not so long, but impressive. Finally some study is being done to map the routes and to use fencing to protect the route.