Description
Castle Island is located at delta of Copper River, 25 mi. SE of Cordova, Malaspina Coastal Plain. 4.5 miles long.
History
Named by H. P. Ritter, U.S. Coast and Geodetic Survey (USC&GS), in 1898. "The Knoll is about 30 ft. high and covered with Alder bushes. There are five large Cottonwood trees on this knoll, and from a distance they resemble the tower of a castle."