During the 1820s, yearly purchases of furs rarely exceeded 20 blankets being sold. Increased amounts of animal hides were gathered by Fort Colvile started with the "Flat Head brigade," which joined the
Bitterroot Salish on their annual migrations past the
Rocky Mountains. The staff number for Fort Colvile fluctuated with the seasons. Operations commencing in the Spring required upwards of 30 employees during the 1830s. Usually only five men were stationed there throughout Winter, and if the number was above that, McLoughlin would reassign the extra staff.
Spokane Garry was considered a prospective employee at the Fort until McLoughlin rejected the proposition. Alex McLeod, born at the fort in 1854 recalled that "The trading post proper was a square enclosure. The store and warehouses were on the north side, and Chief Trader McDonald's house was on the east side. The married employees, like my father, lived outside the enclosed post yard on the south and west sides." The
American Board of Commissioners for Foreign Missions Missionaries established
Tshimakain Mission in 1838. The missionary families of
Elkanah Walker and
Cushing Eells developed ties with Fort Colvile officers and wives, then the closest white settlement in the area. After the
Whitman Massacre, the missionaries fled their station for the protection of the HBC trading post. Agricultural operations at Fort Colvile were prominent, eventually supplying other interior posts with wheat, peas,
flint corn, and potatoes. The prairie that the station was on was deemed an "island of fertility" by visiting artist
Paul Kane. At its foundation, 24 bushels of potatoes were sown, but over half was eaten by rodents. 20 Native and White men labored on the farms in 1838, about two-thirds of the total number of men kept at trade post. The potato harvests had increased greatly in size compared to the initial sowing, in 1838, it was over 7,000 bushels.
Charles Wilkes of the
United States Exploring Expedition found that farming was the primary focus of the establishment "for the whole of the northern posts depend upon Colville for supplies of provisions." Salmon was easily procured when the seasonal runs commenced. One pioneer recalled that Kettle Falls men would "put large wicker baskets below the falls and raised them up three times a day, always filled with fish." ==Later years==