Oregon Trail
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Oregon Trail

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Oregon Trail

The Oregon Trail was a 2,170-mile (3,490 km) east–west, large-wheeled wagon route and emigrant trail in North America that connected the Missouri River to valleys in Oregon Territory. The eastern part of the Oregon Trail crossed what is now the states of Kansas, Nebraska, and Wyoming. The western half crossed the current states of Idaho and Oregon.

The Oregon Trail was laid by fur traders and trappers from about 1811 to 1840 and was initially only passable on foot or horseback. By 1836, when the first migrant wagon train was organized in Independence, Missouri, a wagon trail had been cleared to Fort Hall, Idaho. Wagon trails were cleared increasingly farther west and eventually reached the Willamette Valley in Oregon, at which point what came to be called the Oregon Trail was complete. Further improvements in the form of bridges, cutoffs, ferries, and roads made the trip faster and safer. From starting points in Iowa, Missouri, or Nebraska Territory, the routes converged along the lower Platte River Valley near Fort Kearny, Nebraska Territory. They led to fertile farmlands west of the Rocky Mountains.

The Oregon Trail and its many offshoots were used by about 400,000 settlers, farmers, miners, ranchers, and business owners and their families to get to the area known as Oregon and its surroundings, with traffic especially thick from 1846 to 1869. The eastern half of the trail was also used by travelers on the California Trail from 1843, the Mormon Trail from 1847, and the Bozeman Trail from 1863, before turning off to their separate destinations. Use of the trail declined after the first transcontinental railroad was completed in 1869, making the trip west substantially faster, cheaper, and safer. Since the mid-20th century, modern highways, such as Interstate 80 and Interstate 84, follow parts of the same course westward, and pass through towns originally established to serve those using the Oregon Trail.

The first land route across the present-day contiguous United States was mapped by the Lewis and Clark Expedition between 1804 and 1806, following these 1803 instructions from President Thomas Jefferson to Meriwether Lewis: "The object of your mission is to explore the Missouri river, and such principal stream of it, as, by its course and communication with the waters of the Pacific Ocean, whether the Columbia, Oregon, Colorado and/or other river may offer the most direct and practicable water communication across this continent, for commerce." Although Lewis and William Clark found a path to the Pacific Ocean, it was neither direct nor practicable for prairie schooner wagons to pass through without considerable road work. The two passes they found going through the Rocky Mountains, Lemhi Pass, and Lolo Pass, turned out to be much too difficult.

On the return trip in 1806, they traveled from the Columbia River to the Snake River and the Clearwater River over the Lolo Pass again. They then traveled overland up the Blackfoot River and crossed the Continental Divide at Lewis and Clark Pass, as it would become known, and on to the head of the Missouri River. This was ultimately a shorter and faster route than the one they followed west. This route had the disadvantages of being much too rough for wagons and controlled by the Blackfoot tribes.

Even though Lewis and Clark had only traveled a narrow portion of the upper Missouri River drainage and part of the Columbia River drainage, these were considered the two major rivers draining most of the Rocky Mountains, and the expedition confirmed that there was no "easy" route through the northern Rocky Mountains as Jefferson had hoped. Nonetheless, this famous expedition mapped both the eastern and western river valleys (Platte and Snake Rivers) that bookend the route of the Oregon Trail (and other emigrant trails) across the continental divide—they just had not located the South Pass or some of the interconnecting valleys later used in the high country. They showed the way for the mountain men, who within a decade found a better way across, even if it was not an easy way.

Founded in 1810 by John Jacob Astor as a subsidiary of his American Fur Company (AFC), the Pacific Fur Company (PFC) operated in the Pacific Northwest in the North American fur trade. Two movements of PFC employees were planned by Astor: one sent to the Columbia River aboard the merchant ship Tonquin, the other dispatched overland under an expedition led by Wilson Price Hunt. Hunt and his party were to find possible supply routes and trapping territories for further fur trading posts. Upon arriving at the river in March 1811, the Tonquin crew began building what became Fort Astoria. The ship left supplies and men to continue work on the station and ventured north up the coast to Clayoquot Sound for a trading expedition. While anchored there, Jonathan Thorn insulted an elder Tla-o-qui-aht who was previously elected by the natives to negotiate a mutually satisfactory price for animal pelts. Soon after, the vessel was attacked and overwhelmed by the indigenous Clayoquot, killing many of the crew. Its Quinault interpreter survived and later told the PFC management at Fort Astoria of the destruction. The next day, the ship was blown up by surviving crew members.

Under Hunt, fearing attack by the Niitsitapi, the overland expedition veered south of Lewis and Clark's route into what is now Wyoming and in the process passed across Union Pass and into Jackson Hole, Wyoming. From there they went over the Teton Range via Teton Pass and then down to the Snake River into modern Idaho. They abandoned their horses at the Snake River, made dugout canoes, and attempted to use the river for transport. After a few days' travel, they soon discovered that steep canyons, waterfalls, and impassable rapids made travel by river impossible. Too far from their horses to retrieve them, they had to cache most of their goods and walk the rest of the way to the Columbia River where they made new boats and traveled to the newly established Fort Astoria. The expedition demonstrated that much of the route along the Snake River plain and across to the Columbia was passable by pack train or with minimal improvements, even wagons. This knowledge would be incorporated into the concatenated trail segments as the Oregon Trail took its early shape.

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