between Yukon River and Ickes Slough, 12 mi. SSW of Russian Mission, Yukon-Kuskokwim Delta.
Name shown on 1940 navigation chart of the Yukon River. Because this chart was compiled by the Riverboat Service, the Alaska Railroad, and U.S. Dept. of the Interior, one can assume the island was named for Franklin Delano Roosevelt, 1882-1945, 32nd President of the United States.