The Upper Green River Rendezvous were held in various places near Daniel, Wyoming from 1825 to 1840. The Rendezvous was a colorful trading fair at which trappers, traders, and Indians gathered. It was instituted during the early Rocky Mountain fur trade by General William Ashley, and it effectively revolutionized the trade. Instead of a system of fixed posts to which Indians and trappers came, the rendezvous was a previously established meeting place to which the great supply caravans from St. Louis brought trade goods which were exchanged for the furs. The rendezvous lasted for a few days or at most a few weeks. Grazing and hunting requirements forced the wide dispersal of trappers and traders during the annual get-togethers. The area they encompassed was river grassland from 15 to 20 miles long and from one to five miles wide. Of the 15 annual meetings held, eight of the Rendezvous took place at a Green River site and five convened near the junction of Horse Creek and the Green River. Each year in July a reenactment of the Rendezvous is held in nearby Pinedale.

The Wardell Buffalo Trap is the site of the earliest known communal bison kill involving the use of the bow and arrow on the Northwestern Plains. A bison corral located near the Green River was used by hunters to intercept bison herds moving from grazing lands to the water. Nearly five feet of stratified bison bone levels with radiocarbon dates spanning 500 years of the Late Prehistoric Period have been identified at the site. A large butchering and processing area and campsite are located nearby. Archaeological excavations at the site the early 1970s uncovered outlines of an ancient fence located near the end of a box-canyon into which animals were driven.