Description
On the west slope of the Slate Range at the head of Isham Canyon. (US-T121)
History
Named for William Lewis Manly, who played a large part in the Death Valley Party of 1849, and who refers to this pass in the account of that expedition in "Route of the Manly Party of 1849-1850 in Leaving Death Valley for the Coast", John E Wolff, 1931.