Refer to article, "Huge Dam Dedicated -- Hoover Lauds Enterprise -- Pasadena Structure Viewed as America's Unconquerable Spirit -- Ex-President Commends All Who Toiled on Project in San Gabriel Canyon," Los Angeles Times, 27 May, 1934: 10.
A crowd is gathered to hear former president Herbert Hoover deliver a speech at the Morris Dam dedication. Hoover can be seen on the platform in the left side of the photograph.