Coble Creek vicinity, Washington

On August 25, 1947, Lt. Col. Donald L. Springer of Fourth Air Force A-2 Intelligence at Hamilton Field forwarded a letter from F. M. Johnson, a Portland, Oregon prospector, to the FBI SAC in San Francisco. Johnson wrote that on June 24, 1947, in the Ft. Adams district, he observed round flying objects approximately 30 feet in diameter, traveling at high speed and making no noise, last seen banking on edge into a cloud. Springer noted the similarity to Kenneth Arnold's report while raising the possibility that Johnson had read about Arnold in the newspapers.