No predictions loaded for 1992. This site serves NOAA predictions from its own store, and this period has not been fetched for Back River 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/me/back-river-8416961/1992
Back River, ME tide table 1992 (printable) · Tide Almanac