It is believed that the end of Chief Multnomah's reign occurred with the eruption of Mount Hood during the 1780s. In 1792, Captain George Vancouver and his crew did not encounter Chief Multnomah along their expedition, according to their records, however, later in 1805 when Lewis and Clark reached Sauvie Island they wrote of the mulknomah people. This referenced Chief Multnomah, as well as the group of tribes that made up his people.