Keywords: USAMP RINGGOLD which planted practice groups of mines inthe Columbia River during the 1920's. - NARA - 299666.jpg Scope and content Beginning with the Civil War the U S Army recognized a need to provide for coastal defenses in the Pacific NW along the Columbia River and in the Puget Sound A number of forts many no longer in service were built for this purpose General notes 299666 Local identifier War Department Fourth Army and Western Defense Command ~ Coast Defenses of the Columbia 03/17/1941 - 1946 NARA's Pacific Alaska Region Seattle NRIAS 6125 Sand Point Way NE Seattle WA 98115-7999 other date ~ 1920 Record group Record Group 392 Records of U S Army Coast Artillery Districts and Defenses 1901 - 1950 Record group ARC 690 General History of the Harbor Defenses of the Columbia compiled ca 1945 - ca 1945 documenting the period ca 1864 - ca 1945 Series ARC 299650 File unit File unit ARC Variant control numbers NAIL Control Number NRIS-392-CODEF99B-16 Other versions <gallery> File USAMP_RINGGOLD_which_planted_practice_groups_of_mines_inthe_Columbia_River_during_the_1920's _-_NARA_-_299666 tif tif File USAMP_RINGGOLD_which_planted_practice_groups_of_mines_inthe_Columbia_River_during_the_1920's _-_NARA_-_299666 jpg jpg </gallery> NARA-cooperation PD-USGov Mine warfare ships of the United States Ships built in 1904 Ships of the United States Army Columbia River |