Explorers Lewis and Clark passed through the area in 1805 on the Columbia River, and Marcus and Narcissa Whitman passed through in 1836 to establish a mission at Wailatpu near Walla Walla, Washington.
In the early 19th century, notable travelers Lewis and Clark traveled through the area in 1805 along the Columbia River, while Christian missionaries Marcus and Narcissa Whitman made their way through in 1836 to establish a mission at Wailatpu near Walla Walla, Washington.