No predictions loaded for 2000. This site serves NOAA predictions from its own store, and this period has not been fetched for Washougal 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/wa/washougal-9440047/2000
Washougal, WA tide table 2000 (printable) · Tide Almanac