No predictions loaded for 2030. This site serves NOAA predictions from its own store, and this period has not been fetched for Onion Bay 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/onion-bay-twc2075/2030
Onion Bay, AK tide table 2030 (printable) · Tide Almanac