No predictions loaded for 2014. This site serves NOAA predictions from its own store, and this period has not been fetched for Rio Vista 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/rio-vista-9415316/2014
Rio Vista, CA tide table 2014 (printable) · Tide Almanac