An image of Parker Dam on the Colorado River at the California-Arizona border, 155 miles downstream from Hoover Dam. Parker Dam is commonly referred to as "the deepest dam in the world" because 73% of the dam's structural height is positioned below the original river bed. Note: Boulder Dam was officially renamed Hoover Dam in 1947.
Transcribed from press release attached to photo: "HUGHES READY FOR TAKE-OFF IN SECOND XF-11 FLIGHT. CULVER CITY, Calif., April 5 -- Howard Hughes, famed flier-industrialist, recovered from injuries following crash last July 7, is shown here just before he test-piloted today a duplicate of the plane in which he nearly lost his life. He designed and built the plane, designated XF-11, and one of the world's fastest photo-reconnaissance ships, for the Army Air Forces in conjunction with the Air Materiel Command engineers.