Lewis and Clark Memorial Column, Granite column sculpture in Washington Park, Portland, US.

The Lewis and Clark Memorial Column is a Classical column of Snake River granite, about 34 feet 6 inches tall and 2.5 feet in diameter, topped by a sphere. It stands on a square base roughly 5 feet 5 inches high, whose panels carry bronze seals of Oregon, Washington, Idaho and Montana. A wall with built-in benches surrounds it.

The Lewis & Clark Exposition Commission commissioned the memorial around 1902 for about $10,500 as a gift of the people of Oregon. President Theodore Roosevelt laid the first cornerstone on May 21, 1903, but construction fell behind the planned Exposition deadline and the column was dedicated in 1908. In the 1960s, after vandalism, longshoreman Francis J. Murnane lobbied the city to restore it.

The bronze seals on the base's four sides mark the states once part of the Oregon Territory: Montana faces north, Washington south, Idaho west, and Oregon east toward downtown. The east panel also carries a plaque crediting the citizens of Oregon and naming President Thomas Jefferson as the expedition's sponsor.

The column stands on a square base reached by a short flight of stairs, with a 1998 plaque at the foot of the steps commemorating Amos Nahum King, who sold the land for Washington Park. A low wall with built-in benches surrounds the monument, and its plaques name Henry W. Corbett and Henry W. Goode, presidents of the Lewis & Clark Exposition Commission.

A 1998 plaque at the foot of the stairs honors Amos Nahum King, the landowner who sold the land that became Washington Park to the city for what was called a considerable bargain. His estate also covered the Arlington Heights and Hillside neighborhoods and Macleay Park.