Norbeck-Williamson Act of 1929 or Mount Rushmore National Memorial Act of 1929 established the Mount Rushmore National Memorial Commission defining the powers and purpose of the twelve member committee.

The Act of Congress authorized the Mount Harney Memorial Association of South Dakota to stone carve models of George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt in the Harney National Forest encompassed by the Black Hills National Forest.

The granite sculpture was to be created in accordance with the rock relief designs by Gutzon Borglum.

In 1928, the 70th Congressional session members Peter Norbeck and William Williamson formulated the code of law for the Mount Rushmore National Memorial Act.

The Mount Rushmore National Memorial Commission Act was drafted as six sections describing the purposes of the United States statute.