Letter from the Secretary of the Army transmitting a letter from the Chief of Engineers, United States Army, dated August 15, 1949, submitting a report, together with accompanying papers and illustrations, on a survey of Gila River and tributaries below Gillespie Dam, Ariz. This report is submitted under the authority for a preliminary examination and survey of Gila River, in Arizona, from Gillespie Dam downstream to a point near Wellton, provided by the Flood Control Act approved on August 28, 1937, and under the authority for a preliminary examination and survey of Gila River and tributaries, Arizona and New Mexico, provided by the Flood Control Act approved on June 28, 1938.