In May 1860, the expedition re-commenced their explorations, with Raynolds leading a party north and west up the upstream portion of the Bighorn River, which is known today as the Wind River, hoping to cross the Absaroka Range at Togwotee Pass, a mountain pass expedition guide Jim Bridger knew about. Meanwhile, Maynadier led his party back north to the Bighorn River to explore it and its associated tributary streams more thoroughly. The plan was for the two parties to reunite on June 30, 1860 at Three Forks, Montana, so they could make observations of a total solar eclipse forecast for July 18, 1860. Hampered by towering basaltic cliffs and deep snows, Raynolds attempted for over a week to reconnoiter to the top of Togwotee Pass, but was forced south due to the June 30 deadline for reaching Three Forks. Bridger then led the party south over another pass that Raynolds named Union Pass, to the west of which lay Jackson Hole and the Teton Range. From there the expedition went southwest, crossing the southern Teton Range at Teton Pass and entering Pierre's Hole in present-day Idaho. Though Raynolds and his party managed to get to Three Forks at the scheduled date, Maynadier's party was several days late, too late to allow a detachment to head north to observe the solar eclipse. The reunited expedition then headed home, traveling from Fort Benton, Montana to Fort Union near the Montana-North Dakota border via steamboat. They then journeyed overland to Omaha, Nebraska where the expedition members were disbanded in October 1860.