In 1861, Beale was appointed by President Abraham Lincoln as Surveyor General of California and Nevada. He had an important passage named after him due to his widening of a cut used by the Butterfield Overland Mail, a stagecoach that operated mail between St. Louis, Missouri and San Francisco. In 1862, he dispatched a crew of Chinese workers to widen an 1858 cut, which also reduced the climb by . Beale's Cut, as it was known, lasted as a transportation passage through the modern day Newhall Pass area until the construction of the Newhall Tunnel was completed in 1910. Still in existence today, Beale's cut is no longer passable by automobiles. It is difficult to find today because it is fenced off and not close enough to the Sierra Highway to be easily seen.