The Experiment

By editor

Great Falls, Cascade County, Montana

In the early months of 1803, Captain Meriwether Lewis made a pilgrimage to the U.S. Armory at Harpers Ferry, Virginia, a place better known for churning out rifles than for boatbuilding. But Lewis had a notion that would have made even the most seasoned armory blacksmith blink twice: a portable boat that could be taken apart, packed like a crate, hauled over land, and then reassembled to float down the Missouri River. This was not your average canoe, mind you. It was a 36-foot-long iron frame, shaped like a canoe, but weighing under 200 pounds, designed to carry a staggering 8,000 pounds of cargo. He called it "The Experiment," a name that did not turn out to be ironic, just accurate.

Lewis’s idea was to cover this iron skeleton with animal skins, sealing the seams with pine tar to keep the water out. The plan was to ferry this boat down the Ohio River, then up part of the Mississippi and most of the Missouri, all in a box. The boat’s portability was essential because the expedition anticipated having to drag their boats around the Great Falls of the Missouri, a series of five waterfalls near what is now Great Falls, Montana. The portage around these falls was going to be a slog, and Lewis figured a lighter, sturdier boat would ease the burden.

What Lewis did not foresee was the absence of pine trees where he needed them most. The plan leaned heavily on pine tar, harvested fresh from the forest, for its sealing qualities. But at Great Falls, instead of dense pine forests, the banks were lined mostly with cottonwood trees. Cottonwoods are fine trees for shade and scenery but don’t produce the sticky tar Lewis required. This miscalculation set the stage for failure.

Nevertheless, Lewis pressed on. The men prepared the animal skins, mainly buffalo hides, and concocted a substitute sealant from a mix of pounded charcoal, buffalo tallow, and beeswax. As far as makeshift adhesives go, it was inventive, but it was no pine tar. When the boat was finally assembled and launched, Lewis described it as "a perfect cork on the water," which sounds promising until you realize he was referring to how well it floated, not how well it kept water out.

The leaks began almost immediately. The substitute sealer did not adhere properly to the iron frame or the hides, and water seeped through faster than a gambler’s purse at a card table. Lewis himself admitted the disappointment in a letter, writing, "This circumstance mortified me not a little; the evil was irreparable." William Clark, Lewis’s co-captain and partner in this river venture, noted more pragmatically, "This failure of our favorite boat was a great disappointment to us, we havening more baggage than our Canoes could carry."

Faced with this setback, the expedition had to improvise. Clark assigned some men to carve additional canoes from cottonwood trees along the riverbanks. Cottonwood, while not the most durable wood for boats, was abundant and workable. The resulting dugout canoes and bark canoes could carry the men and their supplies, but they were heavier and less reliable than the envisioned iron and skin "Experiment."

The iron frame boat was buried on July 10, 1805, near the portage at Great Falls. It was left behind, a box of hopes and miscalculations concealed under the Montana soil. The following year, during the return trip in 1806, the crew retrieved the iron frame. After that, the historical record goes silent. No further mention is made of the frame, and to this day its whereabouts remain a mystery. No museum in Harpers Ferry or Montana claims it; it has vanished like many a frontier dream.

To understand why Lewis’s “Experiment” failed, it helps to consider the broader context of the era. The early 1800s were a time of rapid expansion and enormous ambition in the United States. The Louisiana Purchase in 1803 doubled the size of the young nation overnight, but the interior was largely unmapped and unknown to Euro-American settlers. The government, eager to find a navigable water route to the Pacific, poured resources into exploration, hoping to open new trade and land speculation opportunities.

The armory at Harpers Ferry, established in 1799, was a hub of innovation. Its craftsmen were accustomed to building muskets and swords, but turning out a lightweight, sturdy iron boat was another matter entirely. The iron frame was an engineering marvel for its day, but it required materials and environmental conditions that the expedition could not control--chiefly, a steady supply of pine tar.

The failure of "The Experiment" highlights a recurring theme in frontier endeavors: the gap between planning and reality. The expedition relied on incomplete intelligence about the landscape, assuming that pine forests would be available for tar--an assumption that was "mortifying" in Lewis’s own words. This gap was not just a logistical hiccup but a reminder of the limits imposed by geography and the unknown. The mighty Missouri River, with its shifting sandbars, unpredictable falls, and unforgiving terrain, dictated terms, often without regard for human plans.

The economic and social forces behind the expedition were no less complex. The fur trade was booming, with companies eager to exploit new territories. Land speculators were eyeing the vast tracts acquired through the Louisiana Purchase, and the federal government wanted to assert control over these lands before European powers or Indigenous nations could. The expedition was part science, part diplomacy, and part business venture rolled into one.

Despite the failure of the iron boat, the expedition pressed on, relying on traditional wooden canoes and sheer determination. The Great Falls portage alone took nearly a month, with men hauling boats, supplies, and themselves over rugged terrain. The expedition’s success was not in its gadgets but in its adaptability.

The story of "The Experiment" is a footnote in the grand narrative of Lewis and Clark, but it offers a glimpse into the practical hardships and inventive spirit of the time. It also reveals how even the best-laid plans can founder on the facts of the natural world. Lewis’s confidence in new technology met the stubborn reality of Montana’s cottonwood trees, and the iron boat became a buried secret rather than a river champion.

In the end, "The Experiment" was less a failure than a necessary detour--a reminder that exploration is as much about adjusting to what is as it is about dreaming what might be. The Missouri River carried on, indifferent to iron frames and skin seals, and the men who navigated it learned to respect its rules, one portage at a time.

See also

• The Experiment at Great Falls, Cascade County
• Lewis and Clark Portage Route at Great Falls, Cascade County
• Lewis and Clark Passed Here at Great Falls, Cascade County