No predictions loaded for 1994. This site serves NOAA predictions from its own store, and this period has not been fetched for Fort Sumter 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/sc/fort-sumter-8665728/1994
Fort Sumter, SC tide table 1994 (printable) · Tide Almanac