http://tidesandcurrents.noaa.gov/cgi-bin-mp/data_plot.cgi?mins=&datum=0&unit=1&stn=8311062&bdate=20090104&edate=20090505&data_type=wl&relative=&type=Great Lakes Water Level Data&shift=s&plot_size=large&relative=&wl_sensor_hist=W1&plot_backup=