The Green River was the opening waterway of John Wesley Powell’s 1869 expedition, an attempted descent that continued from the river’s confluence with the Colorado River through the Grand Canyon. In the book, the river marks both the expedition’s point of departure into a largely unmapped landscape and the beginning of a perilous journey that would cover nearly a thousand river miles.

The Expedition’s Starting Point

On May 24, 1869, Powell’s party set out from Green River Station, Wyoming, in small wooden boats. Their plan was to follow the Green River downstream to its confluence with the Colorado River, then continue through the treacherous, uncharted chasms of the Grand Canyon. The river was thus the first stage of a route designed to cross what the account describes as the last vast expanse of unexplored wilderness in the contiguous United States.

From the Green to the Grand Canyon

The descent was not a separate excursion on the Green River but the opening stretch of a longer river journey. After nearly a thousand perilous miles, the expedition reached the lower end of the Grand Canyon. There, above what proved to be the voyage’s final dangerous rapids, Seneca Howland, Oramel Howland, and William Dunn left the main party, intending to climb to the canyon’s north rim and travel across the desert to southern Utah settlements.

Historical Significance

The first descent of the Green and Colorado rivers in 1869 signaled the end of Utah’s geographical isolation in the account’s broader history. Alongside the completion of the transcontinental railroad that year, Powell’s expedition represented the opening of a remote region to greater contact with the wider United States. The Green River’s significance here lies in its role as the expedition’s first passage into that wilderness—and the beginning of a route whose dangers and internal strains became inseparable from its exploration.