water levels, tides and currents Tides & Currents http://www.tidesandcurrents.noaa.gov/education.html Tides and Currents Education NOAA's Tides and Currents http://tidesandcurrents.noaa.gov/education.html Tides & Currents Education tidesandcurrents.noaa.gov tidesandcurrents.noaa.gov