No predictions loaded for 2001. This site serves NOAA predictions from its own store, and this period has not been fetched for Collinsville 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/ca/collinsville-9415176/2001
Collinsville, CA tide table 2001 (printable) · Tide Almanac