Coordinates: 45°35′44″N121°11′21.5″W / 45.59556°N 121.189306°W The Wascopam Mission or Dalles Mission was a branch of the Methodist Mission active in the Pacific Northwest. It was the first post established outside the Willamette Valley, opened at Celilo Falls along the Columbia River on March 21, 1838, by Reverends Daniel Lee and Henry K. W. Perkins. 
Lumber for the buildings was cut mostly by neighboring Wascos and the mission was often called Wascopam after them.  The mission consisted of a schoolhouse, garden, stable, barn, and two dwellings along with a cleared pasture adjacent to the wood huts used by the Native American villagers.  Supplies were procured from Hudson's Bay Company stations Fort Vancouver  and Fort Nez Percés  along with the Methodist stations of Mission Bottom and later Mission Mill with Chinookan and Walla Walla escorts. During one such trip the provisions for the party had dwindled and a horse had to be consumed until salmon could be purchased from a Clackamas village.  The main tribes proselytized to from this location were the Walla Wallas, the Wascos, the Wishram, the Klickitats, the Cascades, and the Shastas.  Missionaries used Pulpit Rock to preach to the natives and was at first successful in converting some. 
Pulpit Rock is a rock about 12 feet (3.7 m) tall in what is now The Dalles, Oregon. Prior to European American settlement, the rock was carved by natural elements in an open area on a slight slope.  The Methodist missionaries were known to preach to the local Native Americans during the 1830s and 1840s from this rock.  The rock currently stands in the intersection of E. 12th and Court streets, directly south of The Dalles-Wahtonka High School,  with a historical marker.  The city kept the rock at its location in the middle of a street due to history surrounding the rock.  A mural on a building in downtown The Dalles features the rock prior to the development of the current roads and neighborhood around it. 
The Wascopam Mission was sold for $600 to Marcus Whitman in 1847, who intended to move there.  However after the Whitman massacre and the eruption of the Cayuse War, the mission was occupied by the Oregon militia. The station was returned to the Methodist Mission in 1849, and as the ABCFM had yet to be pay for the station, its bill of purchase was waived.  The Dalles mission did not get used again by the Methodists, and it was sold to the Federal Government for $24,000.
The U.S. Army developed Fort Dalles during the 1850s on the site of the Wascopam Mission, becoming the center of modern town of The Dalles.  The remaining indigenous people inhabiting the surrounding region were evicted by the U.S. Army to the Warm Springs Indian Reservation.  During litigation that reached the Supreme Court in 1883 between the church and settlers in the area, the Methodists land claims of the Dalles were rejected. Three years later the church gave $23,000 to settlers who had previously paid for lots on the now defunct claim. 
The Dalles is the largest city of Wasco County, Oregon, United States. The population was 16,010 at the 2020 census, and it is the largest city on the Oregon side of the Columbia River between the Portland Metropolitan Area, and Hermiston.
The Oregon missionaries were pioneers who settled in the Oregon Country of North America starting in the 1830s dedicated to bringing Christianity to local Native Americans. There had been missionary efforts prior to this, such as those sponsored by the Northwest Company with missionaries from the Church of England starting in 1819. The Foreign Mission movement was already 15 years underway by 1820, but it was difficult to find missionaries willing to go to Oregon, as many wanted to go to the east, to India or China. It was not until the 1830s, when a schoolmaster from Connecticut, Hall Jackson Kelley, created his "American Society for the Settlement of the Oregon Country," that more interest and support for Oregon missionaries grew. Around the same time, four Nez Perce arrived in St. Louis in the fall of 1831, with accounts differencing as to if these travelers were asking for “the book of life,” an idea used by Protestant missionaries, or if they asked for “Blackrobes,” meaning Jesuits, thus Catholic missionaries. Either way this inspired Christian missionaries to travel to the Oregon Territory. Oregon missionaries played a political role, as well as a religious one, as their missions established US political power in an area in which the Hudson’s Bay Company, operating under the British government, maintained a political interest in the Oregon country. Such missionaries had an influential impact on the early settlement of the region, establishing institutions that became the foundation of United States settlement of the Pacific Northwest.
Marcus Whitman was an American physician and missionary.
Jason Lee was a Canadian Methodist Episcopalian missionary and pioneer in the Pacific Northwest. He was born on a farm near Stanstead, Quebec.
The Whitman massacre was the killing of the Washington missionaries Marcus Whitman and his wife Narcissa, along with eleven others, on November 29, 1847. They were killed by members of the Cayuse tribe who accused Whitman of having poisoned 200 Cayuse in his medical care. The incident began the Cayuse War. It took place in southeastern Washington near Walla Walla and was one of the most notorious episodes in the U.S. settlement of the Pacific Northwest. Whitman had helped lead the first wagon train to cross Oregon's Blue Mountains and reach the Columbia River via the Oregon Trail, and this incident was the climax of several years of complex interaction between him and the local Native Americans. The story of the massacre shocked the United States Congress into action concerning the future territorial status of the Oregon Country. The Oregon Territory was established on August 14, 1848.
Celilo Falls was a tribal fishing area on the Columbia River, just east of the Cascade Mountains, on what is today the border between the U.S. states of Oregon and Washington. The name refers to a series of cascades and waterfalls on the river, as well as to the native settlements and trading villages that existed there in various configurations for 15,000 years. Celilo was the oldest continuously inhabited community on the North American continent until 1957, when the falls and nearby settlements were submerged by the construction of The Dalles Dam. In 2019, there were calls by tribal leaders to restore the falls.
The Cayuse War was an armed conflict that took place in the Northwestern United States from 1847 to 1855 between the Cayuse people of the region and the United States Government and local American settlers. Caused in part by the influx of disease and settlers to the region, the immediate start of the conflict occurred in 1847 when the Whitman massacre took place at the Whitman Mission near present-day Walla Walla, Washington when fourteen people were killed in and around the mission. Over the next few years the Provisional Government of Oregon and later the United States Army battled the Native Americans east of the Cascades. This was the first of several wars between the Native Americans and American settlers in that region that would lead to the negotiations between the United States and Native Americans of the Columbia Plateau, creating a number of Indian reservations.
Narcissa Prentiss Whitman was an American missionary in the Oregon Country of what would become the state of Washington. On their way to found the Protestant Whitman Mission in 1836 with her husband, Marcus, near modern-day Walla Walla, Washington, she and Eliza Hart Spalding became the first documented European-American women to cross the Rocky Mountains.
Wasco-Wishram are two closely related Chinook Indian tribes from the Columbia River in Oregon. Today the tribes are part of the Confederated Tribes of Warm Springs living in the Warm Springs Indian Reservation in Oregon and Confederated Tribes and Bands of the Yakama Nation living in the Yakama Indian Reservation in Washington.
The Sager orphans were the children of Henry and Naomi Sager. In April 1844 the Sager family took part in the great westward migration and started their journey along the Oregon Trail. During it, both Henry and Naomi died and left their seven children orphaned. Later adopted by Marcus and Narcissa Whitman, missionaries in what is now Washington, they were orphaned a second time, when both their new parents, as well as brothers John and Francis Sager, were killed during the Whitman massacre in November 1847. About 1860 Catherine, the oldest daughter, wrote a first-hand account of their journey across the plains and their life with the Whitmans. Today it is regarded as one of the most authentic accounts of the American westward migration.
John Minto IV was an American pioneer born in Wylam, England. He was a prominent sheep farmer in the U.S. state of Oregon and a four-time Republican representative in the state legislature. Minto also volunteered for the militia during the Cayuse War and years later helped locate Minto and Santiam passes through the Cascade Mountains east of Salem, Oregon.
The Methodist Mission was the Methodist Episcopal Church's 19th-century conversion efforts in the Pacific Northwest. Local Indigenous cultures were introduced to western culture and Christianity. Superintendent Jason Lee was the principal leader for almost a decade. It was a political and religious effort. Two years after the mission began, the church's Board of Foreign Missions described its intent to reclaim "these wandering savages, who are in a very degraded state, to the blessings of Christianity and civilized life." Alongside the missions founded in the region were several secular operations opened. These were maintained to allow for material independence from the Hudson's Bay Company (HBC), then the preeminent economic entity in the region among European descendants.
Fort Dalles was a United States Army outpost located on the Columbia River at the present site of The Dalles, Oregon, in the United States. Built when Oregon was a territory, the post was used mainly for dealing with wars with Native Americans. The post was first known as Camp Drum and then Fort Drum.
Henry A. G. Lee was a soldier and politician in Oregon Country in the 1840s. A member of Virginia's Lee family, he was part of the Fremont Expedition and commanded troops during the Cayuse War in what became the Oregon Territory. He also was a member of the Oregon Provisional Government and the second editor of the Oregon Spectator.
Billy Chinook was a chief and member of the Wasco tribe. Chinook was a guide for John C. Frémont and Kit Carson, who explored Central Oregon from 1843 to 1844 and from 1845 to 1847. Chinook also served as First Sergeant, U.S. Army Wasco Scouts during the Snake War. Lake Billy Chinook in Oregon is named in his honor.
The Tshimakain Mission started in September 1838, with the arrival of Congregationalist missionaries Cushing and Myra Fairbanks Eells and Elkanah and Mary Richardson Walker to the area along Chamokane Creek at the community of Ford, Washington. Fort Colvile Chief Factor Archibald McDonald recommended the area to Eells and Walker on their first visit to the area.
Pierre Chrysologue Pambrun was a French Canadian militia officer and later a fur trader in the service of the Hudson's Bay Company. Pambrun fought against the United States in the War of 1812, in particular the Battle of the Châteauguay. He joined the HBC during a time of turmoil with its competitors, the North West Company. After the Battle of Seven Oaks, he was among those held captive by men employed by the NWC.
Cushing Eells was an American Congregational church missionary, farmer and teacher on the Pacific coast of America in what are now the states of Oregon and Washington. His first mission in Washington State was unsuccessful. Eells and his family had to leave after the Native Americans massacred a group of neighboring missionaries. They spent the next fourteen years farming and teaching in Oregon, before returning to Washington, where Eells founded a seminary that later became the Whitman College. Eells continued to teach and preach in Washington for the remainder of his life.
The Clatsop Mission was an outpost of the Methodist Mission near modern Astoria, Oregon, United States. Joseph H. Frost and his family was sent to the Clatsop Plains at the mouth of the Columbia River in 1841. Frustrated at his inability to convert the local Clatsop and Nehalem people, Frost took his family and left the area in August 1843. Josiah Parrish was appointed as his replacement, working at the station until its closure the following year in 1844.
Joseph Hasbrouck Frost was an American Methodist Episcopalian missionary in the Pacific Northwest.