No predictions loaded for 2013. This site serves NOAA predictions from its own store, and this period has not been fetched for Adugak Island yet. Nothing is estimated or interpolated in its place. NOAA's own page for the station has the official table: tidesandcurrents.noaa.gov.
tidealmanac.site/us/ak/adugak-island-9462317/2013
Adugak Island, AK tide table 2013 (printable) · Tide Almanac