On June 15, 1806, Meriwether Lewis and the Lewis and Clark expedition encountered unexpected rain as they prepared to retrace their route homeward across the Rocky Mountains. Despite the adverse weather, the team decided to press on, a decision chronicled in Lewis’s journal as they navigated slippery terrain and uncertain conditions. This moment, among others recorded during the famed expedition, offers a window into the challenges faced by early American explorers and underscores the unpredictability that accompanied their journey.
The Lewis and Clark expedition, commissioned by President Thomas Jefferson after the Declaration of Independence’s 250th anniversary and nearly two and a half centuries ago, remains a critical chapter in American history. Its extensive journals—over one million words compiled day by day—reveal not just the factual narrative of exploration, but the uncertainty, choices, and adaptations encountered by the captains and their men.
As they retraced their steps eastward in June 1806, the expedition faced new obstacles. Rain turned to deep snow, coating the trail and obscuring tree markers that signaled their path through the mountains. The snow’s thick crust facilitated movement but also increased risks, sometimes causing horses to break through and become stuck. Their knowledge of the terrain, gathered through interactions with Native leaders and environmental observations, proved insufficient to guarantee a straightforward return.
On June 17, confronted with insurmountable barriers, Lewis described their retreat as a “retrograde march.” To overcome these difficulties, the team dispatched members to find a Native guide familiar with the terrain, allowing them to resume their journey successfully across the Rockies. Yet the expedition’s journals reflect numerous moments where outcomes could have been drastically different, with dangers that might have thwarted their mission entirely or caused severe delays.
The Lewis and Clark records demonstrate the explorers’ reliance on continuous learning and adaptation amid uncertainty, highlighting that historical events were not preordained. These reflections serve as a reminder that past decisions were made in real time, without foresight into their consequences. The expedition’s experience parallels contemporary challenges, illustrating how individuals and societies must navigate unforeseen obstacles.
A free, comprehensive online edition of the 13-volume “Journals of the Lewis and Clark Expedition,” edited by Gary Moulton and supported by the National Endowment for the Humanities, enables readers to explore these primary accounts. The journals invite reflection on the explorers’ hopes, fears, and resilience, revealing how they moved forward despite the unpredictable conditions they faced.